LPS-43687 Minor updates to dl-repository-shared
sync-engine-shared - GetUserSitesGroups
sync-engine-shared - Stub classes
sync-engine-shared - list finders should return Collections.emptyList() so callers know they'll always get something
sync-engine-shared - SF
sync-engine-shared - SF
LRDCOM 7647: Commit liferay-releng.properties
Match 6.1.x