Reviewing D22877: libalias: Add support for RFC 6598/Carrier Grade NAT subnets

[Neel Chauhan]

Hi freebsd-hackers@,

I have a patch available on Phabricator here: 
https://reviews.freebsd.org/D22877

This patch adds an option to libalias and ipfw which supports the RFC 
6598 (Carrier Grade NAT) subnet, also known as 100.64.0.0/10, as well as 
the corresponding documentation.

Could someone please review and if approved, commit this patch?

-Neel

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