rescan-scsi-bus: sgdevice26: do not traverse sg class
if scsi_device isnot added, which would speed up the
rescan flow.
rescan-scsi-bus.sh: add option --no-lip-scan, which would
make FC can rescan device with specific channel and target
Signed-off-by: Wenchao Hao <haowenchao@huawei.com>
