Add a range of rbridge-ids

        Args:
            name  (str): gateway-name
            vlan (str): rbridge-ids range
            callback (function): A function executed upon completion of the
                 method.

        Returns:
           Return value of `callback`.

        Raises:
            None

def hwvtep_add_rbridgeid(self, **kwargs):
        """
        Add a range of rbridge-ids

        Args:
            name  (str): gateway-name
            vlan (str): rbridge-ids range
            callback (function): A function executed upon completion of the
                 method.

        Returns:
           Return value of `callback`.

        Raises:
            None
        """
        name = kwargs.pop('name')
        id = kwargs.pop('rb_range')
        ip_args = dict(name=name, rb_add=id)
        method_name = 'overlay_gateway_attach_rbridge_id_rb_add'
        method_class = self._brocade_tunnels
        gw_attr = getattr(method_class, method_name)
        config = gw_attr(**ip_args)
        output = self._callback(config)
        return output