* stable-2.12:
SubmoduleSubscriptionsIT: Add config with 'submit whole topic' enabled
Fix putTopic hook firing
SubmoduleSubscriptionsIT: Annotate with @NoHttpd
Change.Id: Avoid NumberFormatException on empty user edit ref
RelatedChanges: Show "Submitted Together" also for changes with topic
Set version to 2.11.9
Release notes for Gerrit 2.11.9
Fix duplicate links in document
Fix example for "Set Diff Preferences" in REST API documentation
Change-Id: I74f4e85dda55addfc760fee037b494781b94e3ff
c7f3925202