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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summary: Extra verbose logging of sent and received
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Summary
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Sometimes it is useful to get the raw XML logs from clients for
debugging purposes, but some clients don't expose this.

This module logs dumps everything sent and received into debug logs, for
debugging purposes.