Logging of system/acl events in mod_logging

[mworrell]

Description

This re-uses mod_logging to log more system related events:

• Sudo as another user
• Config changes
• Rate limiter on auth or reset kicking in
• Error during file clamav checks on files
• User changes
• User role changes

Known Issues

• We don't know the user who removed a user-group member (as this is signaled via the edge update log, which is filled via a trigger)

Checklist

• documentation updated
• tests added
• no BC breaks

[mworrell]

@ddeboer Can you give this a test run?

[ddeboer]

Just pushed a fix for the status page, which breaks at z_db:transaction/2 because it has no database connection.

[mworrell]

Which config was set by the status? We could also check on having a db connection, and if not then return an error code from the config-set

[ddeboer]

Ratelimit at the status login:

{rollback,{no_database_connection,[{m_config,set_value,4,[{file,"/Users/david/src/zotonic/src/models/m_config.erl"},{line,181}]},{mod_ratelimit,generate_device_secret, 
…

Checking db conn is probably better; feel free to change!