* stable-2.15:
Keep "refs/publish/*" as a synonym of "refs/for/*"
Update git submodules
Update JGit to 4.9.0.201710071750-r
InitAdminUser: Reindex admin group after adding the user
Fall-back to loading groups from ReviewDb if group index is not available
Change-Id: Id386126b1e277aa7101ba1ab1a4438becf0a39de