'Convert the volume to be of the new type.  Starting from no type.
Returns True if the retype was successful.
Uses taskflow to revert changes if errors occur.
:param volume: A dictionary describing the volume to retype. Except the
volume-type is not used here. This method uses None.
:param new_type: A dictionary describing the volume type to convert to'

def _retype_from_no_type(self, volume, new_type):

    pool = volume_utils.extract_host(volume['host'], 'pool')
    none_type_settings = self.get_volume_settings_from_type_id(None, pool)
    return self._retype_from_old_to_new(volume, new_type, none_type_settings, None)
