Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Upgrade bazlets to latest stable-2.15
  Align Eclipse compiler settings with core Gerrit's
  Upgrade bazlets to latest stable-2.14
  Update bazlets to fix build with bazel 0.23

Change-Id: Ie622141ca7bc693dcad2da43fedf80665bd6c01e