[f-nsp] Preserving double-tagged traffic on ICX6100

[Igor Ybema]

> Thanks to the person who contacted me offlist -- I've been pointed to defect
> 377562, which I'm told is fixed on the FLS but not the ICX.
>
> "Q-in-Q removes the original customer's tag for broadcast"
>

Thanks for sharing. Will receive a couple of ICX's soon and I will
test this asap also. Hopefully Brocade will fix it soon.

regards, igor