Merge branch 'stable-3.0'

* stable-3.0:
  Implement the MessageOfTheDay functionality completely in the plugin
  Upgrade bazlets to latest stable-3.0 to build with 3.0.7 API
  Upgrade bazlets to latest stable-2.16 to build with 2.16.16 API

GetMessage: Adapt apply method return type to Response.

Change-Id: I12e57d0be0cfd73ab0ffbb78577109637456519f