Support ipv6 in geoinfo and Embargo

When someone access the OpenedX website with ipv6 address,GeoIPError('Invalid database type; expected IPv4 address') raised , because we didnot provide GeoIPv6.dat when try to exec  
  country_code = pygeoip.GeoIP(DB_PATH).country_code_by_addr(new_ip_address)
Embargo is also the case


Please, make this one line as I asked.
`is_embargoed = country_code_from_ip in EmbargoedState.current().embargoed_countries_list`