Merge branch 'stable-2.15'

* stable-2.15:
  Upgrade bazlets to latest stable-2.15 to build with 2.15.7 API
  Upgrade bazlets to latest stable-2.14 to build with 2.14.17 API
  WORKSPACE: Make header comment line space indent consistent
  Upgrade bazlets to latest stable-2.15 to build with 2.15.6 API
  WORKSPACE: Make commented out local_path line spaces indent consistent
  Upgrade bazlets to latest stable-2.14 to build with 2.14.16 API
  Align Eclipse compiler settings with core Gerrit's
  bazlets: Replace native.git_repository with skylark rule
  Format all Java files with google-java-format
  Upgrade bazlets to latest stable-2.15 to build with 2.15.5 API
  Upgrade commonmark to 0.10.0
  Update bazlets to latest stable-2.14 to build with 2.14.15 API
  Update bazlets to latest stable-2.15 to build with 2.15.4 API
  GitilesWeblinks: Update file's google-java-format
  Format all Bazel build files with buildifier
  Migrate (i.e. move) `tools/bazel.rc` to `.bazelrc`
  Update bazlets to latest stable-2.14 to build with 2.14.14 API
  Update bazlets to latest stable-2.14 to build with 2.14.13 API
  Update bazlets to latest stable-2.14 to use 2.14.12 API
  Update bazlets to latest stable-2.14 to use 2.14.11 API
  Update bazlets to latest stable-2.14 to use 2.14.10 API
  Update bazlets to latest stable-2.14 and switch to released 2.14.9 API
  Harmonize names of external repositories
  Build with 2.14.9-SNAPSHOT

Change-Id: I59d49825fda606cc7720d8e4a1bc46d6d186df22