Bring "netstat -R" to stable10

[hiren panchasara]

I want to use netstat -R on stable10 and following 2 commits are needed
to be MFC'd for that:
https://svnweb.freebsd.org/base?view=revision&revision=266418
https://svnweb.freebsd.org/base?view=revision&revision=266448

r266418 adds a field to 'struct inpcb' but it uses a spare field so I
_think_ it's MFCable and doesn't break KBI/KPI? 

Can someone please comment if that's not the case?

Cheers,
Hiren
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