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


I have added  GEOIPv6_PATH = REPO_ROOT / "common/static/data/geoip/GeoIPv6.dat" both in lms.envs.common and cms.envs.common
When i try to exec:

    edxapp@ifLab:/edx/app/edxapp/edx-platform$ ./manage.py lms --settings aws shell
    2014-08-06 01:23:46,930 INFO 25363 [dd.dogapi] dog_stats_api.py:66 - Initializing dog api  to     use statsd: localhost, 8125
    Python 2.7.3 (default, Feb 27 2014, 19:58:35) 
    [GCC 4.6.3] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    (InteractiveConsole)

    >>> from lms.envs.common import *
    >>> GEOIPv6_PATH
    path(u'/edx/app/edxapp/edx-platform/common/static/data/geoip/GeoIPv6.dat')
    >>> from django.conf import settings
    >>> settings.GEOIPv6_PATH
    Traceback (most recent call last):
     File "<console>", line 1, in <module>
     File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-      packages/django/utils/functional.py", line 185, in inner
    return func(self._wrapped, *args)
    AttributeError: 'Settings' object has no attribute 'GEOIPv6_PATH'
    >>>