Merge branch 'stable-3.0'

* stable-3.0:
  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: Ic31c01a99e18dc9e9e2a265defd7a8762b4680e2