Merge branch 'stable-3.0'

* stable-3.0:
  Make transitive starlark loads explicit
  Make transitive starlark loads explicit
  Make transitive starlark loads explicit
  Make transitive starlark loads explicit
  Upgrade bazlets to latest master to build with 3.0.0 API
  Upgrade bazlets to latest master to build with 3.0.0-rc3 API

Change-Id: Ic46f7b9704e90984283d7c55950cc564fece5e0e