Merge branch 'stable-2.16'

* stable-2.16:
  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
  Upgrade bazlets to latest stable-2.16 to build with 2.16.5 API

Change-Id: I921c91e5b9b6f9fadf6b57323cd420978708b0fa