Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Upgrade bazlets to latest stable-3.0 to build with 3.0.9 API
  Upgrade bazlets to latest stable-2.16 to build with 2.16.19 API

Change-Id: I3b2897d237e84d749497e25b7d79d3d8dbe998a1