Make Travis builds faster in master (certbot#5314)

* Remove extra le-auto tests from master

* Remove dockerfile-dev test from master

* Remove intermediate Python 3.x tests from master

* Reorder travis jobs for speed

.travis.yml

@@ -12,34 +12,37 @@ before_script:
 
 matrix:
   include:
+    - python: "2.7"
+      env: TOXENV=py27_install BOULDER_INTEGRATION=1
+      sudo: required
+      services: docker
     - python: "2.7"
       env: TOXENV=cover FYI="this also tests py27"
+    - sudo: required
+      env: TOXENV=nginx_compat
+      services: docker
+      before_install:
+      addons:
     - python: "2.7"
       env: TOXENV=lint
-    - python: "2.7"
-      env: TOXENV=py27-oldest
-      sudo: required
-      services: docker
     - python: "2.6"
       env: TOXENV=py26
       sudo: required
       services: docker
     - python: "2.7"
-      env: TOXENV=py27_install BOULDER_INTEGRATION=1
+      env: TOXENV=py27-oldest
       sudo: required
       services: docker
-    - sudo: required
-      env: TOXENV=apache_compat
+    - python: "3.3"
+      env: TOXENV=py33
+      sudo: required
       services: docker
-      before_install:
-      addons:
-    - sudo: required
-      env: TOXENV=nginx_compat
+    - python: "3.6"
+      env: TOXENV=py36
+      sudo: required
       services: docker
-      before_install:
-      addons:
     - sudo: required
-      env: TOXENV=le_auto_precise
+      env: TOXENV=apache_compat
       services: docker
       before_install:
       addons:
@@ -48,40 +51,9 @@ matrix:
       services: docker
       before_install:
       addons:
-    - sudo: required
-      env: TOXENV=le_auto_wheezy
-      services: docker
-      before_install:
-      addons:
-    - sudo: required
-      env: TOXENV=le_auto_centos6
-      services: docker
-      before_install:
-      addons:
-    - sudo: required
-      env: TOXENV=docker_dev
-      services: docker
-      before_install:
-      addons:
     - python: "2.7"
       env: TOXENV=apacheconftest
       sudo: required
-    - python: "3.3"
-      env: TOXENV=py33
-      sudo: required
-      services: docker
-    - python: "3.4"
-      env: TOXENV=py34
-      sudo: required
-      services: docker
-    - python: "3.5"
-      env: TOXENV=py35
-      sudo: required
-      services: docker
-    - python: "3.6"
-      env: TOXENV=py36
-      sudo: required
-      services: docker
     - python: "2.7"
       env: TOXENV=nginxroundtrip