init amqp for registrar cache flush

kamailio/default.cfg

@@ -662,6 +662,13 @@ event_route[kazoo:mod-init]
 
     #!endif
 
+    #!ifdef REGISTRAR-ROLE
+
+    $var(payload) = "{ 'exchange' : 'callmgr' , 'type' : 'topic', 'queue' : 'MSG-FLUSH-MY_HOSTNAME', 'routing' : 'registration.flush.*', 'auto_delete' : 1, 'durable' : 0, 'no_ack' : 1, 'wait_for_consumer_ack' : 0 }";
+    kazoo_subscribe("$var(payload)");
+
+    #!endif
+
 }
 
 event_route[kazoo:consumer-event]