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ipfw nat: add missing bits after r357092 (RFC 6598/Carrier Grade NAT)

Description

ipfw nat: add missing bits after r357092 (RFC 6598/Carrier Grade NAT)

Submitted by: Neel Chauhan <neel AT neelc DOT org>
Reviewed by: Lutz Donnerhacke
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D23448