Replace geoip database support with maxminddb #1828
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The former geoip databases are no longer maintained, but libmaxminddb is. So switch to this.
Currently the output is limited to the country iso code. I haven't tried very hard to get state/province information, but this can be added if it's desired (I don't see a lot of use in it personally, but I'm not opposed to adding it).
I've only tested with the
GeoLite2-Country.mmdb
database.The
<geoipdb>
configuration setting has been re-used for this.If the database file cannot be opened, an error is logged. Should it exit as well?