BROOKLYN-32: remove LGPLed MaxMind GeoIP

Brooklyn `core` embeds a copy of MaxMind GeoIP Java library. This is licensed under LGPL2.1, which is incompatible with the Apache license - therefore it is not suitable to be part of Brooklyn core. This PR makes the removal, and changes the default GeoIP lookup to use the "utrace" service instead.

Note that it is possible to create a new project that includes just the MaxMind GeoIP dependency and the Brooklyn HostGeoLookup class, and users could install that module themselves, if they want to use MaxMind GeoIP. That is outside the scope of this PR.