'Show domain group option configuration.
For a full list of available parameters, please refer to the official
API reference:
http://developer.openstack.org/api-ref/identity/v3/index.html#show-domain-group-option-configuration'

def show_domain_group_option_config(self, domain_id, group, option):

    url = ('domains/%s/config/%s/%s' % (domain_id, group, option))
    (resp, body) = self.get(url)
    self.expected_success(200, resp.status)
    body = json.loads(body)
    return rest_client.ResponseBody(resp, body)
