Merge branch 'stable-2.16'

* stable-2.16:
  Format Java files with google-java-format 1.7
  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

Change-Id: Ia374dd4b76a6213871a2b4b397ef51a4b7b8fbdd