Merge branch 'stable-2.15'

* stable-2.15:
  Bazel: Include eclipse-out directory in .bazelignore
  Add explanatory comment to empty BUILD file(s)
  Upgrade bazlets to latest stable-2.15 to build with 2.15.7 API
  Upgrade bazlets to latest stable-2.14 to build with 2.14.17 API
  Upgrade bazlets to latest stable-2.15 to build with 2.15.6 API
  WORKSPACE: Make commented out local_path line spaces indent consistent
  Upgrade bazlets to latest stable-2.14 to build with 2.14.16 API
  Align Eclipse compiler settings with core Gerrit's
  bazlets: Replace native.git_repository with skylark rule
  Upgrade bazlets to latest stable-2.15 to build with 2.15.5 API
  Upgrade bazlets to latest stable-2.14 to build with 2.14.15 API
  Update bazlets to latest stable-2.15 to build with 2.15.4 API
  Migrate (i.e. move) `tools/bazel.rc` to `.bazelrc`
  Update bazlets to latest stable-2.14 to build with 2.14.14 API
  Update bazlets to latest stable-2.14 to build with 2.14.13 API
  Update bazlets to latest stable-2.14 to use 2.14.12 API
  Allow login during readonly
  Rename ssh commands from put/delete/get to enable/disable/status
  ReadOnlyByHttpIT: Add assertion that REST call worked as expected
  Add tests for enabling/disabling read-only mode by SSH command
  Remove custom servlet and associated tests
  Use RestApiServlet and SSH commands for plugin actions
  Allow to switch read only mode on/off
  Update bazlets to latest stable-2.14 to use 2.14.11 API
  ReadOnly: Use String#equals to compare strings
  Format bzl files with buildifier
  Update bazlets to latest stable-2.14 to use 2.14.10 API
  Update bazlets to latest revision on stable-2.14

Change-Id: I23c7d8af83de47982ebee122a1eeed1d4e08a009