* stable-2.16:
Set version to 2.15.16-SNAPSHOT
Fix ls-user-ref and use the correct identity for listing refs
Set version to 2.15.15
ReceiveCommits: Fix comparison to ensure correct log message
Set sshd.threads to at least 4.
Add assertThrows method compatible with future JUnit 4.13
ReceiveCommits: Bypass commit count when skip-validation is used
Update git submodules
Update git submodules
Update git submodules
Update git submodules
Update git submodules
Update git submodules
Update git submodules
change-merged: set correct newRev on submit by push
Change-Id: I481b3cb4d4998b7d387262ab523c53407f5841b5
50b7b8a2c0