Merge branch 'stable-3.1'

* stable-3.1:
  Upgrade bazlets to latest stable-3.1 to build with 3.1.12 API
  Upgrade bazlets to latest stable-3.0 to build with 3.0.15 API
  Upgrade bazlets to latest stable-2.16 to build with 2.16.26 API
  Upgrade bazlets to latest stable-3.1 to build with 3.1.11 API
  Upgrade bazlets to latest stable-2.16 to build with 2.16.23 API

Change-Id: I32be27106575dedd900e2098e904ef6359b6616a