mod_pubsub_serverinfo: implemented all basic features This commit replaces the earlier proof-of-concept to a solution that: - reports on remotely-connected domains - uses disco/info to detect if those domains opt-in - publishes domain names for remote domains that do so - caches the disco/info response

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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.