When setting KTRACE in the environment, client and server write
ktrace files. This simplifies debugging as system calls can be
inspected with kdump.

Add tests for pf divert-packet. Currently UDP packets are tested
with in and out rules. A single packet, the initial packet or the
response packet are diverted and reinjected.

Fix some Perl statements perlcritic was bitching about: Variable
declared in conditional statement.

Make the perl modules consistent for the multiple regression tests.
This includes coding style, better error messages and variable
naming.

Grep pf state table on remote machine to find state reuse problems.

Add a regression test suite for the pf divert-to and divert-reply
feature. It requires two machines, the local host is running the
regression test, the remote host gets pf divert rules installed.
Th

Add a regression test suite for the pf divert-to and divert-reply
feature. It requires two machines, the local host is running the
regression test, the remote host gets pf divert rules installed.
The diverted TCP connections are running between these hosts in
both directions. The remote host is controlled via ssh.

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