Merge branch 'stable-3.0'

* stable-3.0:
  Upgrade bazlets to latest stable-3.0
  Upgrade bazlets to latest stable-2.16
  Bazel: Migrate workspace status script to python
  Upgrade bazlets to latest stable-2.16

Change-Id: I750c2f81c21f7bec460b694d67059b8947cbf55d