Merge branch 'stable-2.15'

* stable-2.15:
  Upgrade bazlets to latest stable-2.15 to build with 2.15.6 API
  Upgrade bazlets to latest stable-2.14 to build with 2.14.16 API
  Align Eclipse compiler settings with core Gerrit's
  WORKSPACE: Make header line space indent consistent

Change-Id: I4e334002367054fc21640f4b8ebf804c627f1cba