tcp: add TH_AE capabilities to ppp and pf

Add support for the AE Flag in the TCP header to pf and ppp.
Commonalize to the use of "E"(ECE), "W"(CWR) and "e"(AE)
for the TCP header flags, in line with

tcp: add TH_AE capabilities to ppp and pf

Add support for the AE Flag in the TCP header to pf and ppp.
Commonalize to the use of "E"(ECE), "W"(CWR) and "e"(AE)
for the TCP header flags, in line with tcpdump.

Reviewers: kp, cc, tuexen, cy, #transport!
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D47106

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Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

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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