[c-nsp] disabling GigE negotiation on NX-OS

[Brad Hedlund (brhedlun)]

"link came up for me.  again -- this is with n5000, not n5500, but i
wouldn't think too great of a difference?"

GigE support has been available for quite some time on the N5000, but
only recently added to N5500:

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/release
/notes/Rel_5_0_3_N1_1/Nexus5000_Release_Notes_5_0_3_N1_1_1b.html#wp31528
9 



Cheers,
Brad