IPFW: more "orthogonal? state operations, push into 11?

[Lev Serebryakov]

 I still hope to see https://reviews.freebsd.org/D1776 committed before
11-RELEASE.

 It seems to me, that I does everything what was requested by reviewers.

 Pleeeeease?

-- 
// Lev Serebryakov

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