Merge branch 'stable-2.16'

* stable-2.16:
  Upgrade bazlets to latest stable-2.16 to build with 2.16.8 API
  Upgrade bazlets to latest stable-2.15 to build with 2.15.13 API
  Upgrade bazlets to latest stable-2.14 to build with 2.14.20 API

Change-Id: Ic4d23eef4bf300c9b4ce82ec2e947d36d739b82d