geoip: s/misc::geoip/geoip/

Remove the misc::geoip class in favor of the new overhauled geoip class.
This is a no-op for production but it does change labs significantly, as
labs instances will now sync all databases via puppet, instead of using
the Debian package (this means up-to-date databases too, though!)

Change-Id: I4080cef4e1378debf95df3c7db5d23f1468c9f0e