Subclass this function for your own needs.
           Or just pass the version as part of the URL
           (e.g. client._('/v3'))
        :param url: URI portion of the full URL being requested
        :type url: string
        :return: string

def _build_versioned_url(self, url):
        """Subclass this function for your own needs.
           Or just pass the version as part of the URL
           (e.g. client._('/v3'))
        :param url: URI portion of the full URL being requested
        :type url: string
        :return: string
        """
        return '{}/v{}{}'.format(self.host, str(self._version), url)