* stable-2.13:
WatchConfig: Add synchronization to prevent concurrent read/write
VersionedAuthorizedKeys: Synchronize read/write of the git repository
Add release notes for Gerrit 2.13.2
Update git submodules
ProjectAccessHandler: Check for CLA before creating changes
Read project watches from ReviewDb
Fix server error when navigating up to change while working
Change-Id: If2495aea9fb278b729e8d13a506a7e9bf8de9fed