Remove $FreeBSD$: one-line sh pattern

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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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netpfil tests: improve pft_ping.py

Multiple improvements to pft_ping.py:

* Automatically use IPv6 when IPv6 addresses are used, --ip6 is not needed.
* Building of ping requests and parsing of ping

netpfil tests: improve pft_ping.py

Multiple improvements to pft_ping.py:

* Automatically use IPv6 when IPv6 addresses are used, --ip6 is not needed.
* Building of ping requests and parsing of ping replies is done layer by
layer. This way most arguments are available both for IPv6 and IPv4,
for ICMP and TCP.
* Use argument groups for improved readability.
* Change ToS and TTL argument name to TC and HL to reflect the modern
IPv6 nomenclature. The argument still set related IPv4 header fields
properly.
* Instead of sniffing for the very specific case of duplicated packets,
allow for sniffing on multiple interfaces.
* Report which sniffer has failed by setting bits of error code.
* Raise meaningful exceptions when irrecoverable errors happen.
* Make IPv4 fragmentation flags configurable.
* Make IPv6 HL / IPv4 TTL configurable.
* Make TCP MSS configurable.
* Make TCP sequence number configurable.
* Make ICMP payload size configurable.
* Add debug output.
* Move command line argument parsing out of network functions.
* Make the code somehow PEP-8 compliant.

MFC after: 1 week
Sponsored by: InnoGames GmbH
Differential Revision: https://reviews.freebsd.org/D38122

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tests/sys/netpfil/pf: Add missing python3 requirements

This also fixes a typo in the dup test that caused the head function to
not be called. On my test system without python3 the tests are now
skip

tests/sys/netpfil/pf: Add missing python3 requirements

This also fixes a typo in the dup test that caused the head function to
not be called. On my test system without python3 the tests are now
skipped instead of failing.

Reviewed By: kp
Differential Revision: https://reviews.freebsd.org/D28903

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pf tests: Test that dup-to doesn't produce extra duplicate packets