Let plugins hook into service startup to notify 3rd party daemon.

This commit adds support for calling plugin hooks when all services
have been started properly. Useful for, e.g., a 3rd party service
monitor to trigger further events on.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

svc.c

@@ -400,7 +400,8 @@ void svc_start_all(void)
 			svc_reload(svc);
 	}
 
-	/* XXX: Hook point for plugins. */
+	_d("Running svc up hooks ...");
+	run_hooks(HOOK_SVC_UP);
 }