Make the return type of maybe_autodelete distinct from that of

conditional_delete, and be more strict matching its return values.
Confusion over those led to the delete hook not being called when an
exchange was autodeleted as a result of a queue being deleted.

It now calls delete_binding then delete in this scenario, rather than
just delete, to be consistent with the other place in which exchanges
are autodeleted (when a binding is deleted directly).

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