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
  ValidatorConfig: Remove redundant else-clause
  Align Eclipse compiler settings with core Gerrit's
  WORKSPACE: Make commented out lines spaces indent consistent

Change-Id: Idb8544e27a359ae4b5cf38ecbc62adc566820634