'Removes the export configuration for the given volume.
The equivalent CLI command is "no lun export container
<container_name> name <lun_name>"
Arguments:
volume -- volume object provided by the Manager'

def _unexport_lun(self, volume, target, connector):

    v = self.common.vmem_mg
    LOG.info('Unexporting    lun    %(vol)s    host    is    %(host)s.', {'vol': volume['id'], 'host': connector['host']})
    try:
        self.common._send_cmd(v.lun.unassign_lun_from_iscsi_target, 'Unassign    device    successfully', volume['id'], target, True)
    except exception.ViolinBackendErrNotFound:
        LOG.info('Lun    %s    already    unexported,    continuing...', volume['id'])
    except Exception:
        LOG.exception('LUN    unexport    failed!')
        msg = _('LUN    unexport    failed')
        raise exception.ViolinBackendErr(message=msg)
