Merge branch 'stable-3.1'

* stable-3.1:
  Upgrade bazlets to latest stable-3.1
  Upgrade bazlets to latest stable-3.0
  Upgrade bazlets to latest stable-2.16
  Upgrade bazlets to latest stable-2.15
  Upgrade bazlets to latest stable-2.14

Change-Id: I544c77b1d3fa34aa9f7ffc3e695aa3c85759908a