OF-2951: Async stanza delivery #2653
Open
+68
−36
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Adds a facility to allow for non-blocking stanza delivery.
The new facility is used when probing presence of entities on remote domains (as that can slow down a client that's connecting to Openfire).
Potentially this could/should be used in other places too (as the act of delivery doesn't return a result, and thus isn't expected to be needing a blocking operation), but I thought it best to take baby steps here.