Merge branch 'stable-3.0'

* stable-3.0:
  Upgrade wiremock to 2.25.0
  Upgrade bazlets to latest stable-2.16 to build with 2.16.12 API
  Upgrade bazlets to latest stable-2.15 to build with 2.15.17 API

Change-Id: If584ade148d51d25d8a456e5fbf9071ca798dd2e