Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Bump Bazel version to 2.0.0
  Bazel: Remove empty glob
  Upgrade bazlets to latest stable-2.16 to build with 2.16.15 API
  Upgrade bazlets to latest stable-2.16 to build with 2.16.14 API
  Upgrade bazlets to latest stable-2.16 to build with 2.16.13 API
  Upgrade bazlets to latest stable-2.16
  Upgrade bazlets to latest stable-2.15 to build with 2.15.18 API
  Bazel: Migrate workspace status script to python
  Upgrade bazlets to latest stable-2.15
  Upgrade bazlets to latest stable-2.14
  Upgrade bazlets to latest stable-2.16
  Upgrade bazlets to latest stable-2.15
  Upgrade bazlets to latest stable-2.14
  Bump Bazel version to 1.1.0
  Remove bazel-genfiles from .gitignore
  Replace bazel-genfiles with bazel-bin in documentation

Change-Id: I83a8f4400e5f49b1453bbeac3cd93733a26be3fb