Merge branch 'stable-3.2'

* stable-3.2:
  Upgrade bazlets to latest master to build with 3.2.2 API
  Upgrade bazlets to latest stable-3.1 to build with 3.1.7 API
  Upgrade bazlets to latest stable-3.0 to build with 3.0.11 API
  Remove the commented-out snapshot plugin api lines
  Upgrade bazlets to latest master
  Adapt SNAPSHOT plugin api example to the 3.1 version
  Upgrade bazlets to latest stable-3.1
  Prepare for new gerrit_api snapshot version usage
  Upgrade bazlets to latest stable-3.0
  Upgrade bazlets to latest stable-3.0

Change-Id: I64fbacc293d35c6068e2dd3dc59d9b257422f7c9