Merge branch 'stable-2.15'
* stable-2.15:
bazlets: Replace native.git_repository with skylark rule
Upgrade bazlets to latest stable-2.15 to build with 2.15.5 API
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
Format all Bazel build files with buildifier
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
Format all build files with buildifier 0.15.0
Update bazlets to latest stable-2.15
Migrate `tools/bazel.rc` to `.bazelrc`
Remove obsolete ignoreDrafts configuration option
Update bazlets to latest stable-2.14 to use 2.14.11 API
Update bazlets to latest stable-2.14 to use 2.14.9 API
Update bazlets to latest revision on stable-2.14
Change-Id: I8c3d87999cbbf014cf84cc867f0415fb76d31721
