'Removes a membership from the image.
For a full list of available parameters, please refer to the official
API reference:
http://developer.openstack.org/api-ref/image/v1/#remove-member'

def delete_image_member(self, image_id, member_id):

    url = ('images/%s/members/%s' % (image_id, member_id))
    (resp, __) = self.delete(url)
    self.expected_success(204, resp.status)
    return rest_client.ResponseBody(resp)
