update dbqueuemanager to respect handler timeout values

lib/dbqueuemanager.php

@@ -55,7 +55,8 @@ class DBQueueManager extends QueueManager
     {
         while (true) {
             $this->_log(LOG_DEBUG, 'Checking for notices...');
-            $notice = $this->_nextItem($queue, null);
+            $timeout = $handler->timeout();
+            $notice = $this->_nextItem($queue, $timeout);
             if (empty($notice)) {
                 $this->_log(LOG_DEBUG, 'No notices waiting; idling.');
                 // Nothing in the queue. Do you