Merge branch 'stable-2.16'

* stable-2.16:
  audit: import AuditEvent from server package
  Upgrade bazlets to latest master to build with 2.16-rc3 API
  Migrate `tools/bazel.rc` to `.bazelrc`
  Upgrade bazlets to latest stable-2.15 to build with 2.15.7 API
  Upgrade bazlets to latest stable-2.15 to build with 2.15.6 API
  Align Eclipse compiler settings with core Gerrit's
  WORKSPACE: Make commented out lines spaces indent consistent
  bazlets: Replace native.git_repository with skylark rule
  Upgrade bazlets to latest stable-2.15 to build with 2.15.5 API
  Update bazlets to latest stable-2.15 to build with 2.15.4 API
  Replace Guava functional constructs with Java native ones
  Remove final qualifiers
  Fix broken build status badge link
  Allow to protect specific projects against deletion
  Add tests for protected projects

Change-Id: I95885756e46761fb020bc21739b33a5470a62524