mod_admin_blocklist: Add config option for which role(s) to consider (0.12+) Fixes that in trunk, a "prosody:operator" (formerly a global admin) is not considered a "prosody:admin", so those were not included in the set.

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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.