Stomp controlBus creates a lot of dead letters

[scothis]

The channels on the controlBus are intended for optional/advisory subscriptions, if nobody is listening, the message will be forwarded to the deadLetterChannel, creating noise on that channel that isn't interesting or worse, misleading.

To suppress the deadLetterChannel we could either introduce a new channel type that ignores dead letters or register the noopHandler to each channel.