Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Upgrade bazlets to latest stable-2.16 to build with 2.16.17 API
  Upgrade bazlets to latest stable-3.0 to build with 3.0.8 API

Change-Id: Idfe1fe177cceab3d011e1c91f4bec0a75d5d6235