Merge branch 'stable-3.3'

* stable-3.3:
  Set Gerrit to v3.3.1
  Set to Gerrit v3.2.6
  Set to Gerrit v3.1.11
  Initial events-broker implementation for Gerrit v3.0.x

Change-Id: Ic4386e1a4cb280d77e763028fca8aab1e5caa956