Bazel: Consume mockito library from plugin API

Since release 3.0 mockito library (and its dependencies) is part of the
plugin API.

This change can only be verified positively using Iad6d8417 which is not
released yet. Hence switch the plugin api from release to snapshot until
that release is ready for use.

Change-Id: Ic7b7e20879b4404758cd55727d8238c6e882020e
3 files changed