* stable-2.15:
Make ChangeControl package-private
Don't log a stacktrace when reading a LargeObjectTombstone
Update git submodules
IndexChangeIT: Test index of change after its owner loses access
ChangeData: Prevent false 'Merge Conflict' for user's open review
GroupIncludeCacheImpl: Remove unnecessarily nested else clauses
Evaluate streams in GroupIncludeCacheImpl while the db is still open
Don't treat MergeIdenticalTreeException as internal server error
Allow plugin IT test to get location of plugin data dir
Update git submodules
Update git submodules
Change-Id: I204451aa6e7fc0ef01cdf803f42d7ff5c0f053e7
af3cd51f10