[frr] ietf-idr-bgp-shutdown draft

[Donald Sharp]

All -

Thanks to David Lamparter and Christian Franke for their hard-work on
getting this draft into FRR.

'neighbor <A.B.C.D|X:X::X:X|WORD> shutdown message MSG...'

https://tools.ietf.org/html/draft-ietf-idr-shutdown-06

thanks!

donald