'Deletes a domain.
For APi details, please refer to the official API reference:
http://developer.openstack.org/api-ref/identity/v3/index.html#delete-domain'

def delete_domain(self, domain_id):

    (resp, body) = self.delete(('domains/%s' % domain_id))
    self.expected_success(204, resp.status)
    return rest_client.ResponseBody(resp, body)
