'Delete a namespace object
For a full list of available parameters, please refer to the official
API reference:
http://developer.openstack.org/api-ref/image/v2/metadefs-index.html#delete-object'

def delete_namespace_object(self, namespace, object_name):

    url = ('metadefs/namespaces/%s/objects/%s' % (namespace, object_name))
    (resp, _) = self.delete(url)
    self.expected_success(204, resp.status)
    return rest_client.ResponseBody(resp)
