mark all messages enqueued in the slave as 'delivered'

which is a much better than the set_delivered logic, which we can now
get rid of.
In doing so it also becomes clear that having the 'delivered' flag in
the #message_properties is less than ideal. It is mutable and we never
bothered updating vq s.t. it sets the flag correctly. So lets get rid
of it and add a parameter to bq:publish instead

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