Merge branch 'stable-2.16'

* stable-2.16:
  Upgrade bazlets to latest stable-2.16 to build with 2.16.6 API
  Documentation: Fix the in-tree bazel test command
  Upgrade bazlets to latest stable-2.15 to build with 2.15.11 API

Change-Id: Ica8e6e8fbd877887498d9c9a14e8bf947e481ee3