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: I14adf03e5bd2f5099349bec8587389c7803b215c