mod_pubsub_serverinfo: Disco/info cache TTL should be configurable This module caches the disco/info results of remote domains. This commit introduces a new configuration option that allows an admin to configure the cache expiry duration.

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summary: Log a message once per minute
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This module sends `-- MARK --` to the log once per minute. This may be
useful to give a sense of how busy the server is or see that logging and
timers are still working.