Merge branch 'stable-3.1' into stable-3.2 * stable-3.1: 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: If7b6f69d6d8230c12dedfd514f3dbed8ef919876