* stable-2.15:
Update git submodules
Elasticsearch lib: extract Jest into its own (lib)
Add back <strong> tag in HTML revert notification email
AbstractQueryChangesTest: Add test coverage for the tr: and bug: queries
Improve wording of revert notification email subject
AbstractQueryChangesTest: Add test coverage of the reviewerin: predicate
AbstractQueryChangesTest: Add test for ownerin: query on merged change
AbstractQueryChangesTest: Add test for query with multiple labels
VersionedAccountDestinations: Fix Javadoc
Change-Id: I4267bd7c9c1864109a1e05900a3a67cfebb5cc22
861613772e