Travis: Initiating build for commit '29ba89aa83604d13987e746354e78bef189127d5' on branch '3490_user_id': refs #6162 Extending config setting enable_processing_unique_visitors_* to also affect the nb_uniq_users metric processing over periods, + only show Users metrics when it's greater than zero, + fix more tests and renamed test suite to UserIdAndVisitorIdTest