[c-nsp] ipv6 nhrp

[Chris Conn]

Hello,

What platforms other than 18xx support;

int Tunnel6
!
    ...
    ipv6 nhrp ...
    ...
!
?

I have tried to find supported platforms and have come up nil.  Feature 
navigator doesn't seem to make a difference between nhrp/dmvpn and ipv6 
nhrp/dmvpn.

Thanks,

Chris