Merge branch 'stable-2.16'

* stable-2.16:
  Set Gerrit to 2.16.13
  Set Gerrit to 2.15.18
  Set version to 2.16.12
  Set Gerrit to 2.15.17
  Set Gerrit to 2.15.16
  Set Gerrit to 2.15.15
  Set Gerrit to 2.15.14

Change-Id: Ie37bdee43b1c58d29942b943888827d571f9ce79