'Removes a property definition from a namespace.
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#remove-property-definition'

def delete_namespace_property(self, namespace, property_name):

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