Revert "3581 IPv6 support"

console

libs/MaxMindGeoIP/geoip.inc

libs/MaxMindGeoIP/geoipcity.inc

libs/MaxMindGeoIP/geoipregionvars.php

plugins/UserCountry/LocationProvider.php

plugins/UserCountry/LocationProvider/GeoIp/Php.php

tests/PHPUnit/Fixtures/ManyVisitsWithGeoIP.php

tests/PHPUnit/System/ManyVisitorsOneWebsiteTest.php

...t_AutoSuggestAPITest__Live.getLastVisitsDetails_range.xml

...APITest_countryCode__API.getSuggestedValuesForSegment.xml

...estAPITest_latitude__API.getSuggestedValuesForSegment.xml

...stAPITest_longitude__API.getSuggestedValuesForSegment.xml

...isitorsOneWebsiteTest__UserCountry.getContinent_month.xml

...yVisitorsOneWebsiteTest__UserCountry.getCountry_month.xml

...isitorsOneWebsiteTest__UserCountry.getLocationFromIP.json