mod_cloud_notify: use stanza from mod_smacks to behave O(1) This uses the provided stanza in the ack-delayed smacks event to trigger push for this stanza only rather than iterating through the whole smacks queue to find the first unpushed stanza.

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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.