Reload_registry message: make sure to trigger only if required. This can end up in a loop.

(cherry picked from commit 7565e76)

Author: cdujeu

core/src/plugins/core.mq/class.MqManager.php

@@ -205,7 +205,7 @@ public function clientChannelMethod($action, $httpVars, $fileVars)
                 $channelRepository = str_replace("nodes:", "", $httpVars["channel"]);
                 if($channelRepository != $currentRepository){
                     AJXP_XMLWriter::header();
-                    echo "<require_registry_reload/>";
+                    echo "<require_registry_reload repositoryId=\"$currentRepository\"/>";
                     AJXP_XMLWriter::close();
                     return;
                 }