Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  bazlets: Replace native.git_repository with skylark rule
  Update bazlets to latest stable-2.14 to build with 2.14.15 API
  Format all Bazel build files with buildifier

Change-Id: I68ebc94e2a15f72dfe007878aaf072b4ef2ea47a