Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Fix the version of postgresql used in the test container
  Factor creation of test container out to a common method
  Upgrade bazlets to latest stable-2.16 to build with 2.16.9 API
  Upgrade bazlets to latest stable-2.15
  Upgrade bazlets to latest stable-2.14

Change-Id: I638cccc429203c4e2516bf451583ac532854cbf9