Merge branch 'stable-3.0'

* stable-3.0:
  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: I0f2031e674d5612094f9960f7e07d967acf39fd1