mod_pubsub_serverinfo: Detect existence of pub/sub node Instead of blindly trying to create the pub/sub node to publish items to, a service discovery query is performed to check if node creation is required. Added various bits of warn and debug logging, to give a user better feedback if and why something is failing.

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labels:
- Stage-Alpha
summary: "XEP-0397: Instant Stream Resumption"
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Experimental and incomplete implementation of [XEP-0397: Instant Stream Resumption].