On shutdown Notification Service cleans up the naming service reference of the notify-factory, but not any channels generated due to command line options.

This behavior looks inconsistent to me. I assume, that in a persistent 
setup, with reconnect capabilities we might not want to clean up any reference in the naming service at all. But if we clean up the factory reference, we might as well clean up the references to generated channels.

Speaking of cleanup: Would it make sense to destroy all created channels 
before exit in a non-persistent setup? If I understand it correctly, this would call disconnect on all consumers and suppliers, giving them a chance to do something about the fact, that the service is about to be no longer available.