Merge branch 'stable-2.16'
* stable-2.16:
Upgrade bazlets to latest stable-2.15 to build with 2.15.10 API
Upgrade bazlets to latest stable-2.16 to build with 2.16.4 API
Upgrade bazlets to latest stable-2.15 to build with 2.15.9 API
Upgrade bazlets to latest stable-2.15 to build with 2.15.8 API
Upgrade bazlets to latest stable-2.14 to build with 2.14.18 API
Bazel: Include eclipse-out directory in .bazelignore
Add explanatory comment to empty BUILD file(s)
Change-Id: I0467ee0dced8cc5109def53be2db21d03cfcdcdc