Merge branch 'stable-3.0'

* stable-3.0:
  Bazel: Consume mockito library from plugin API
  Align tests target name prefix with plugin name
  Upgrade bazlets to latest stable-2.15 to build with 2.15.14 API

Change-Id: I01a02302e4221cd1ee4a2367c43d5f7adc61b731