Merge branch 'stable-2.15' into stable-2.16
* stable-2.15:
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: I2aa88b659c17cf643e2914989e1331f67718f595
