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
  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: I90d5dc3c25f580420c96c141623ff92355e3a5f0