Allow dead lettering with TTL to the same queue

[KinaneD]

As a feature, this offers some kind of out of the box message re-queueing with TTL.

Expected behaviour, similar to recover or reject(true), i.e. to re-queue dead message to the same queue but with TTL.
Main issue is that configuring dlx, declares the dlx exchange and queue, so at this point the queue is being declared again with a new TTL setting, which is not allowed.

[KinaneD]

Check
https://github.com/rabbitmq/rabbitmq-delayed-message-exchange