Allow countryCode lookups for IPv6 addresses

We are lacking GeoIP city databases for IPv6 addresses, so our lookups
of location information for IPv6 addresses failed [1]. As some scripts
rely on such lookups to obtain countryCodes, and countryCodes can be
fed from the GeoIPv6.dat GeoIP database, we now at least fill country
information when trying get the location of IPv6 addresses.

[1] Pig logs showed
  IO Exception while seting up segments
errors.

Change-Id: I2f350e1201dfc1af4f96d3176cfa15e4edf9500e