mod_cloud_notify: Don't notify for all smacks queued stanzas in a row Only send out a notification for the first unnotified stanza in the smacks queue, not for all queued stanzas in a row. Several notifications in the same second are useless and just cause server load on both ends.

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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.