Start Trigger daemon alongside other daemons

Summary: Ref T6881. This won't do much of interest on third party installs yet, but it's stable and we don't need to hold it back any longer.

Test Plan: Ran `phd start`, saw the trigger daemon start up.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T6881

Differential Revision: https://secure.phabricator.com/D11603

src/applications/daemon/management/PhabricatorDaemonManagementWorkflow.php

@@ -340,6 +340,7 @@ abstract class PhabricatorDaemonManagementWorkflow
     $daemons = array(
       array('PhabricatorRepositoryPullLocalDaemon', array()),
       array('PhabricatorGarbageCollectorDaemon', array()),
+      array('PhabricatorTriggerDaemon', array()),
     );
 
     $taskmasters = PhabricatorEnv::getEnvConfig('phd.start-taskmasters');