Add --print-stacktrace-exception argument to pants invocations in ci.sh

When the build fails in ci, the stacktrace is suppressed by default. This change tacks on the --print-exception-stacktrace to each invocation of pants. (except for during the building of the distribution - it doesn't work then.)

Testing Done:
CI is running at https://travis-ci.org/pantsbuild/pants/builds/33585119

Bugs closed: 524

Reviewed at https://rbcommons.com/s/twitter/r/942/

build-support/bin/ci.sh

@@ -77,14 +77,20 @@ for constraint in ${INTERPRETER_CONSTRAINTS[@]}; do
   )
 done
 
+PANTS_ARGS=(
+  "--print-exception-stacktrace"
+  "${INTERPRETER_ARGS[@]}"
+)
+
+
 if [[ "${skip_bootstrap:-false}" == "false" ]]; then
   banner "Bootstrapping pants"
   (
     ./build-support/python/clean.sh && \
     PANTS_DEV=1 PANTS_VERBOSE=1 PEX_VERBOSE=1 PYTHON_VERBOSE=1 \
-      ./pants goal ${INTERPRETER_ARGS[@]} binary src/python/pants/bin:pants && \
+      ./pants goal ${PANTS_ARGS[@]} binary src/python/pants/bin:pants && \
     mv dist/pants.pex ./pants.pex && \
-    ./pants.pex goal goals
+    ./pants.pex goal goals ${PANTS_ARGS[@]}
   ) || die "Failed to bootstrap pants."
 fi
 
@@ -98,10 +104,10 @@ if [ ! -z "${R}" ]; then
 fi
 
 # Sanity checks
-./pants.pex goal clean-all || die "Failed to clean-all."
-./pants.pex goal goals || die "Failed to list goals."
-./pants.pex goal list :: || die "Failed to list all targets."
-./pants.pex goal targets || die "Failed to show target help."
+./pants.pex goal clean-all ${PANTS_ARGS[@]} || die "Failed to clean-all."
+./pants.pex goal goals ${PANTS_ARGS[@]} || die "Failed to list goals."
+./pants.pex goal list :: ${PANTS_ARGS[@]} || die "Failed to list all targets."
+./pants.pex goal targets ${PANTS_ARGS[@]} || die "Failed to show target help."
 
 if [[ "${skip_distribution:-false}" == "false" ]]; then
   # TODO(John Sirois): Take this further and dogfood a bootstrap from the sdists generated by
@@ -127,7 +133,7 @@ if [[ "${skip_python:-false}" == "false" ]]; then
   (
     # TODO(Eric Ayers): Substitute tests/python:: when all tests are working that way
     PANTS_PYTHON_TEST_FAILSOFT=1 ./pants.pex goal test tests/python/pants_test:all \
-      ${INTERPRETER_ARGS[@]}
+      ${PANTS_ARGS[@]}
   ) || die "Core python test failure"
 fi
 
@@ -151,14 +157,14 @@ if [[ "${skip_testprojects:-false}" == "false" ]]; then
 
   banner "Running tests in testprojects/ "
   (
-    ./pants.pex goal test testprojects:: $daemons $android_test_opts $exclude_opts
+    ./pants.pex goal test testprojects:: $daemons $android_test_opts $exclude_opts ${PANTS_ARGS[@]}
   ) || die "test failure in testprojects/"
 fi
 
 if [[ "${skip_examples:-false}" == "false" ]]; then
   banner "Running example tests"
   (
-    ./pants.pex goal test examples:: $daemons $android_test_opts
+    ./pants.pex goal test examples:: $daemons $android_test_opts ${PANTS_ARGS[@]}
   ) || die "Examples test failure"
 fi
 
@@ -167,7 +173,7 @@ if [[ "${skip_integration:-false}" == "false" ]]; then
   banner "Running Pants Integration tests"
   (
     PANTS_PYTHON_TEST_FAILSOFT=1 ./pants.pex goal test tests/python/pants_test:integration \
-      ${INTERPRETER_ARGS[@]}
+      ${PANTS_ARGS[@]}
   ) || die "Pants Integration test failure"
 fi