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 end the paren on its own line 
```python
self.patcher = patch.object(
   pygeoip.GeoIP, 'country_code_by_addr', self.mock_country_code_by_addr
)
```