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)
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D33510

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Update ipfilter 4.1.28 --> 5.1.2.

Approved by: glebius (mentor)
BSD Licensed by: Darren Reed <darrenr@reed.wattle.id.au> (author)

import ipfilter 4.1.8 into the vendor branch

Import IPFilter 3.4.25

Import IPFilter version 3.4.20

Import IP Filter 3.4.12

Import of ipfilter 3.3.8

Approved by: jkh

Import of ipfilter 3.3.3 in anticipation of its revival.
More to come in the next days.

Import ipfilter 3.2.1 (update from 3.1.8)

Import IP Filter v3.1.7 into FreeBSD tree