Merge branch 'stable-2.16'

* stable-2.16:
  Update mockito-core to 2.24.0
  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

Change-Id: I90e78f4c85da5f8bb4a8e2423e06c7042547ea88