[ewg] libibnetdisc: Add grouping for Voltaire's ISR4700 switch

[Sasha Khapyorsky]

On 14:35 Tue 27 Apr     , sebastien dugue wrote:
> 
>   The ISR4700 features 3 kind of boards:
>     
>   - sLB-4018 line board with a single 36 port asic
>   - sFB-4700 fabric board with a single 36 port asic
>   - sFB-4700X2 double density fabric board with 2 36 port asics
>     
>   The double density fabric board (sFB-4700X2) features external 12X
> connectors that are only an aggregation of 3 4X ports, therefore
> ext_portnum is set to match the number printed on the faceplate.
>     
> Signed-off-by: Sebastien Dugue <sebastien.dugue at bull.net>

Applied. Thanks.

Sasha