Merge branch 'stable-2.16'

* stable-2.16:
  Upgrade bazlets to latest stable-2.16
  Upgrade bazlets to latest stable-2.15
  Upgrade bazlets to latest stable-2.14
  Update bazlets to fix build with bazel 0.23
  Update bazlets to fix build with bazel 0.23
  Upgrade bazlets to latest stable-2.16 to build with 2.16.6 API
  Upgrade bazlets to latest stable-2.15 to build with 2.15.11 API

Change-Id: I36a1698dc5e64c6a69547afb0f15fe6f5a194d40