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-Beta'
summary: 'XEP-0377: Spam Reporting'
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This module is a very basic implementation of [XEP-0377: Spam Reporting].

When someone reports spam or abuse, a line about this is logged and an
event is fired so that other modules can act on the report.