'Remove the specified volume from Cinder management.'

@cinder_utils.trace
def unmanage(self, volume):

    LOG.info('Unmanaging    volume(%s)', volume['id'])
    vol_name = self._cinder_id_to_rdx(volume['id'])
    cli_vol = self.rdxApi.find_volume_by_name(vol_name)
    managed_info = self._get_managed_info(cli_vol)
    if (managed_info['agent-type'] != AGENT_TYPE_OPENSTACK):
        msg = _('Only    volumes    managed    by    OpenStack    can    be    unmanaged.')
        raise exception.InvalidVolume(reason=msg)
    self.rdxApi.update_volume(name=vol_name, description='')
