ipfilter: Adjust userland returns to conform to style(9)

Adjust ipfilter's userland return statements to conform to style(9).

(cherry picked from commit 2582ae5740181e0d2bab10003d66ae91c9b56329)

ipflter: ANSIfy userland function declarations

Convert ipfilter userland function declarations from K&R to ANSI. This
syncs our function declarations with NetBSD hg commit 75edcd7552a0
(apply our ch

ipflter: ANSIfy userland function declarations

Convert ipfilter userland function declarations from K&R to ANSI. This
syncs our function declarations with NetBSD hg commit 75edcd7552a0
(apply our changes). Though not copied from NetBSD, this change was
partially inspired by NetBSD's work and inspired by style(9).

Reviewed by: glebius (for #network)
Differential Revision: https://reviews.freebsd.org/D33595

(cherry picked from commit efeb8bffe34422937c7f8df836afb5b817366d16)

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ipfilter: Move userland bits to sbin

Through fixes and improvements our ipfilter sources have diverged
enough to warrant move from contrib into sbin/ipf. Now that I'm
planning on implementing MSS cl

ipfilter: Move userland bits to sbin

Through fixes and improvements our ipfilter sources have diverged
enough to warrant move from contrib into sbin/ipf. Now that I'm
planning on implementing MSS clamping as in iptables it makes more
sense to move ipfilter to sbin.

This is the second of three commits of the ipfilter move.

Suggested by glebius on two occaions.

Suggested by and discussed with: glebius
Reviewed by: glebius, kp (for #network)
Differential Revision: https://reviews.freebsd.org/D33510

(cherry picked from commit 41edb306f05651fcaf6c74f9e3557f59f80292e1)

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