Leverage default targets throughout pants BUILDs.

Add support for the default name protocol to managed_jar_dependencies to
support this cleanup sweep.

Testing Done:
Brought to you almost completely by sed and bash:
```
find . -name "BUILD*" | \
xargs grep -E "name\s*=" | \
sed -r -e "s|((.*/)?([^/]+)/BUILD[^:]*):.*name\s*=\s*['\"]([^'\"]+)['\"].*|\1 \3 \4|" | \
while read file dir name
do
  [ "$dir" == "$name" ] && echo "$file $name"
done | \
sort -u | \
while read file name
do
  sed -ri \
    -e "s|(\s*name\s*=\s*['\"]$name['\"]\s*,\s*|(|" \
    -e "/name\s*=\s*['\"]$name['\"]/d" $file
done
```

For posterity, the 1 code (non-BUILD) change is here:
  https://rbcommons.com/s/twitter/r/4287/diff/1?page=5#98

CI went green here:
  https://travis-ci.org/pantsbuild/pants/builds/165928657

Bugs closed: 3936

Reviewed at https://rbcommons.com/s/twitter/r/4287/

3rdparty/jvm/com/google/auto/value/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-jar_library(name='value',
+jar_library(
   jars=[
     jar(org='com.google.auto.value', name='auto-value', rev='1.1'),
   ],

3rdparty/jvm/commons-io/BUILD

@@ -1,5 +1,4 @@
 jar_library(
-  name='commons-io',
   jars=[
     jar(org='commons-io', name='commons-io', rev='2.4'),
   ],

contrib/android/examples/src/android/example_library/BUILD

@@ -3,7 +3,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 android_library(
-  name='example_library',
   manifest='AndroidManifest.xml',
   libraries=['contrib/android/examples/3rdparty/android:android-support-v4'],
   include_patterns=[

contrib/android/examples/src/android/hello/BUILD

@@ -3,7 +3,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 android_binary(
-  name='hello',
   sources=rglobs('src/*.java'),
   manifest='AndroidManifest.xml',
   dependencies = [

contrib/android/examples/src/android/hello_with_library/BUILD

@@ -3,7 +3,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 android_binary(
-  name='hello_with_library',
   sources=rglobs('main/src/*.java'),
   manifest='main/AndroidManifest.xml',
   dependencies = [

contrib/cpp/examples/src/cpp/calcsqrt/BUILD

@@ -3,7 +3,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 cpp_binary(
-  name='calcsqrt',
   sources=['main.cc'],
   libraries=['m'],
 )

contrib/cpp/examples/src/cpp/example/hello/BUILD

@@ -3,7 +3,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 cpp_library(
-  name='hello',
   sources=[
     'hello.cc',
     'hello.h',

contrib/cpp/src/python/pants/contrib/cpp/targets/BUILD

@@ -3,7 +3,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name='targets',
   sources=[
     'cpp_binary.py',
     'cpp_library.py',

contrib/cpp/src/python/pants/contrib/cpp/tasks/BUILD

@@ -3,7 +3,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name='tasks',
   sources=[
     'cpp_compile.py',
     'cpp_binary_create.py',

contrib/cpp/src/python/pants/contrib/cpp/toolchain/BUILD

@@ -3,7 +3,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name='toolchain',
   sources=[
     'cpp_toolchain.py',
   ],

contrib/findbugs/src/python/pants/contrib/findbugs/tasks/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name='tasks',
   sources=[
     'findbugs.py',
   ],

contrib/findbugs/tests/python/pants_test/contrib/findbugs/tasks/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_tests(
-  name='tasks',
   sources=['test_findbugs.py'],
   dependencies=[
     'contrib/findbugs/src/python/pants/contrib/findbugs/tasks:tasks',

contrib/go/src/python/pants/contrib/go/subsystems/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name='subsystems',
   sources=globs('*.py'),
   dependencies=[
     '3rdparty/python:requests',

contrib/go/src/python/pants/contrib/go/targets/BUILD

@@ -1,5 +1,4 @@
 target(
-  name='targets',
   dependencies=[
     ':go_binary',
     ':go_library',

contrib/go/src/python/pants/contrib/go/tasks/BUILD

@@ -1,5 +1,4 @@
 target(
-  name='tasks',
   dependencies=[
     ':go_binary_create',
     ':go_buildgen',

contrib/node/examples/3rdparty/node/babel-loader/BUILD

@@ -1,4 +1,3 @@
 node_remote_module(
-  name='babel-loader',
   version='5.3.2'
 )

contrib/node/examples/3rdparty/node/babel/BUILD

@@ -1,4 +1,3 @@
 node_remote_module(
-  name='babel',
   version='5.8.23'
 )

contrib/node/examples/3rdparty/node/css-loader/BUILD

@@ -1,4 +1,3 @@
 node_remote_module(
-  name='css-loader',
   version='0.17.0'
 )

contrib/node/examples/3rdparty/node/mocha/BUILD

@@ -1,4 +1,3 @@
 node_remote_module(
-  name='mocha',
   version='2.3.0'
 )

contrib/node/examples/3rdparty/node/null-loader/BUILD

@@ -1,4 +1,3 @@
 node_remote_module(
-  name='null-loader',
   version='0.1.1'
 )

contrib/node/examples/3rdparty/node/react/BUILD

@@ -1,4 +1,3 @@
 node_remote_module(
-  name='react',
   version='0.13.3'
 )

contrib/node/examples/3rdparty/node/style-loader/BUILD

@@ -1,4 +1,3 @@
 node_remote_module(
-  name='style-loader',
   version='0.12.3'
 )

contrib/node/examples/3rdparty/node/webpack/BUILD

@@ -1,4 +1,3 @@
 node_remote_module(
-  name='webpack',
   version='1.12.0'
 )

contrib/node/examples/src/node/preinstalled-project/BUILD

@@ -2,7 +2,6 @@
 # an alternative Node module resolver.
 
 node_preinstalled_module(
-  name='preinstalled-project',
   sources=globs('package.json', 'src/*.js', 'test/*.js'),
   dependencies_archive_url=
     'https://dl.bintray.com/pantsbuild/node-preinstalled-modules/node_modules.tar.gz'

contrib/node/examples/src/node/server-project/BUILD

@@ -3,7 +3,6 @@
 # package.json enough to get this benefit without any duplication.
 
 node_module(
-  name='server-project',
   sources=globs('package.json', 'checkarg', 'src/*.js', 'test/*.js'),
   dependencies=[
     'contrib/node/examples/3rdparty/node/babel',

contrib/node/examples/src/node/web-build-tool/BUILD

@@ -1,5 +1,4 @@
 node_module(
-  name='web-build-tool',
   sources=globs('package.json','web-build-tool','webpack.config.base.js'),
   dependencies=[
     'contrib/node/examples/3rdparty/node/babel-loader',

contrib/node/examples/src/node/web-component-button/BUILD

@@ -1,5 +1,4 @@
 node_module(
-  name='web-component-button',
   sources=globs('package.json', 'webpack.config.js', 'src/*', 'test/*'),
   dependencies=[
     'contrib/node/examples/3rdparty/node/mocha',

contrib/node/examples/src/node/web-project/BUILD

@@ -1,5 +1,4 @@
 node_module(
-  name='web-project',
   sources=globs('package.json', 'webpack.config.js', 'src/*', 'test/*'),
   dependencies=[
     'contrib/node/examples/3rdparty/node/mocha',

contrib/node/src/python/pants/contrib/node/subsystems/resolvers/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 target(
-  name='resolvers',
   dependencies=[
     ':npm_resolver',
     ':node_preinstalled_module_resolver',

contrib/node/src/python/pants/contrib/node/targets/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 target(
-  name='targets',
   dependencies=[
     ':node_module',
     ':node_preinstalled_module',

contrib/node/src/python/pants/contrib/node/tasks/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 target(
-  name='tasks',
   dependencies=[
     ':node_repl',
     ':node_resolve',

contrib/python/src/python/pants/contrib/python/isort/BUILD

@@ -1,5 +1,4 @@
 python_binary(
-  name='isort',
   source='isort.py',
   dependencies=[
     '3rdparty/python:isort',

contrib/python/tests/python/pants_test/contrib/python/checks/tasks/checkstyle/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_tests(
-  name='checkstyle',
   sources=globs('*.py'),
   dependencies=[
     'contrib/python/src/python/pants/contrib/python/checks/tasks/checkstyle:all',

contrib/scalajs/examples/src/scala/org/pantsbuild/scalajs/example/factfinder/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-scala_js_binary(name='factfinder',
+scala_js_binary(
   dependencies=[
     'examples/src/scala/org/pantsbuild/example/fact:fact-js',
   ],

contrib/scalajs/src/python/pants/contrib/scalajs/subsystems/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name = 'subsystems',
   dependencies = [
     'contrib/node/src/python/pants/contrib/node/subsystems/resolvers:node_resolver_base',
     'src/python/pants/option',

contrib/scalajs/src/python/pants/contrib/scalajs/targets/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name = 'targets',
   dependencies = [
     'contrib/node/src/python/pants/contrib/node/targets:node_module',
     'contrib/scalajs/src/python/pants/contrib/scalajs/subsystems',

contrib/scalajs/src/python/pants/contrib/scalajs/tasks/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name = 'tasks',
   dependencies = [
     'contrib/scalajs/src/python/pants/contrib/scalajs/targets',
     'src/python/pants/backend/jvm/tasks/jvm_compile:zinc',

contrib/scalajs/tests/scala/org/pantsbuild/scalajs/example/factfinder/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-junit_tests(name='factfinder',
+junit_tests(
   dependencies=[
     '3rdparty:guava',
     '3rdparty:junit',

contrib/scrooge/examples/src/thrift/org/pantsbuild/contrib/scrooge/android_generator/BUILD

@@ -1,5 +1,4 @@
 java_thrift_library(
-  name='android_generator',
   sources=['struct.thrift'],
   compiler='scrooge',
   language='android',

contrib/scrooge/examples/src/thrift/org/pantsbuild/contrib/scrooge/dummy_generator/BUILD

@@ -1,5 +1,4 @@
 java_thrift_library(
-  name='dummy_generator',
   sources=['dummy.thrift'],
   compiler='scrooge',
   language='android',

contrib/scrooge/src/python/pants/contrib/scrooge/tasks/BUILD

@@ -2,7 +2,6 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 python_library(
-  name='tasks',
   dependencies=[
     ':scrooge_gen',
     ':thrift_linter',

examples/src/antlr/org/pantsbuild/example/exp/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-target(name='exp',
+target(
   dependencies=[
     ':exp_antlr3',
     ':exp_antlr4',

examples/src/java/org/pantsbuild/example/annotation/example/BUILD

@@ -3,7 +3,7 @@
 #
 #  Example of annotation_processor() target
 
-java_library(name='example',
+java_library(
   sources=['Example.java'],
   # Is used by an annotation processor.
   scope='compile',

examples/src/java/org/pantsbuild/example/annotation/main/BUILD

@@ -3,7 +3,7 @@
 #
 #  Example for annotation_processor() target
 
-jvm_binary(name='main',
+jvm_binary(
   source='Main.java',
   main='org.pantsbuild.example.annotation.main.Main',
   basename = 'annotation-example',

examples/src/java/org/pantsbuild/example/annotation/processor/BUILD

@@ -3,7 +3,7 @@
 #
 #  Example of annotation_processor() target
 
-annotation_processor(name='processor',
+annotation_processor(
   sources=['ExampleProcessor.java'],
   processors=['org.pantsbuild.example.annotation.processor.ExampleProcessor'],
   dependencies=[

examples/src/java/org/pantsbuild/example/antlr3/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-jvm_binary(name='antlr3',
+jvm_binary(
   source='ExampleAntlr3.java',
   main='org.pantsbuild.example.antlr3.ExampleAntlr3',
   dependencies=[

examples/src/java/org/pantsbuild/example/antlr4/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-jvm_binary(name='antlr4',
+jvm_binary(
   source='ExampleAntlr4.java',
   main='org.pantsbuild.example.antlr4.ExampleAntlr4',
   dependencies=[

examples/src/java/org/pantsbuild/example/autovalue/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-jvm_binary(name='autovalue',
+jvm_binary(
   main = 'org.pantsbuild.example.autovalue.AutoValueMain',
   dependencies = [
     ':autovalue-lib',

examples/src/java/org/pantsbuild/example/hello/simple/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-jvm_binary(name = 'simple',
+jvm_binary(
   source = 'HelloWorld.java',
   main = 'org.pantsbuild.example.hello.simple.HelloWorld',
 )

examples/src/java/org/pantsbuild/example/java_sources/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-java_library(name = 'java_sources',
+java_library(
   sources = globs('*.java'),
   dependencies = [
    'examples/src/scala/org/pantsbuild/example/scala_with_java_sources',

examples/src/java/org/pantsbuild/example/jaxb/main/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-jvm_binary(name='main',
+jvm_binary(
   basename='jaxb-example',
   dependencies=[
     'examples/src/java/org/pantsbuild/example/jaxb/reader',

examples/src/java/org/pantsbuild/example/jaxb/reader/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-java_library(name='reader',
+java_library(
   dependencies=[
     'examples/src/resources/org/pantsbuild/example/jaxb',
   ],

examples/src/java/org/pantsbuild/example/make_it_rain/BUILD

@@ -1,7 +1,7 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-java_library(name='make_it_rain',
+java_library(
   sources=['MakeItRain.java',],
   dependencies=[
     '3rdparty:thrift-0.9.2',