Add destruction of listeners

The listeners aren't really destroyed and are only stopped. Further
changes are required so that they won't be started again once they have
been destroyed.

server/core/service.c

@@ -490,7 +490,7 @@ int serviceInitialize(SERVICE *service)
     return listeners;
 }
 
-bool serviceStartListener(SERVICE *service, SERV_LISTENER *port)
+bool serviceLaunchListener(SERVICE *service, SERV_LISTENER *port)
 {
     return serviceStartPort(service, port);
 }