bind for federated flush messages (#169)

kamailio/default.cfg

@@ -842,7 +842,7 @@ event_route[kazoo:mod-init]
 
     #!ifdef DISPATCHER_ROLE
 
-    $var(payload) = "{ 'exchange' : 'registrar' , 'type' : 'topic', 'queue' : 'MSG-FLUSH-MY_HOSTNAME', 'routing' : 'registration.flush.*', 'queue-def' : {'auto_delete' : 1}, 'no_ack' : 1, 'wait_for_consumer_ack' : 0 }";
+    $var(payload) = "{ 'exchange' : 'registrar' , 'type' : 'topic', 'queue' : 'MSG-FLUSH-MY_HOSTNAME', 'routing' : 'registration.flush.*', 'federate' : 1, 'queue-def' : {'auto_delete' : 1}, 'no_ack' : 1, 'wait_for_consumer_ack' : 0 }";
     kazoo_subscribe("$var(payload)");
 
     #!endif