Remove $FreeBSD$: one-line sh pattern

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

tests: Only log critical errors from scapy

Since 2.4.5 scapy started issuing warnings about a few different
configurations during our tests. These are harmless, but they generate
stderr output, whic

tests: Only log critical errors from scapy

Since 2.4.5 scapy started issuing warnings about a few different
configurations during our tests. These are harmless, but they generate
stderr output, which upsets atf_check.

Configure scapy to only log critical errors (and thus not warnings) to
fix these tests.

MFC after: 1 week
Sponsored by: Rubicon Communications, LLC ("Netgate")

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ip6 tests: Add very simplistic extension header tests

Add a simple test case which can exercise some of the IPv6 extension
header code paths. At the moment only a small set of extension headers
is

ip6 tests: Add very simplistic extension header tests

Add a simple test case which can exercise some of the IPv6 extension
header code paths. At the moment only a small set of extension headers
is implemented and no options to the ones which take them.
Also implements a "bad" case to make sure that error handling works.

The tests were used to test m_pullup() changes to the code paths while
removing the KAME PULLDOWN_TEST cases and related macros.

MFC after: 3 weeks
Sponsored by: Netflix

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