Rather than providing a custom Atffile that requires separate
maintenance, just don't build or install the t_bpf.sh test.

Disable test cases which have not worked in ages instead of skipping them.

Get rid of static Atffiles and let bsd.test.mk generate them on the fly.

Do not use awk to generate the test program. Use some eval magic to generate
the tests on the fly alongside with easier-to-read functions.

While doing this, split the big monolithic test program in

Do not use awk to generate the test program. Use some eval magic to generate
the tests on the fly alongside with easier-to-read functions.

While doing this, split the big monolithic test program into more granular
but cohesive test programs.

Phew, this one was tough. And it's horrible to see that many these tests
(yes, the tests themselves probably) are broken.

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Add the ipf tests developed by Lukasz Strzygowski as part of the atfify
GSoC 2008 project. These were originally inside the kernel subdirectory
but I think they belong in their own top-level directo

Add the ipf tests developed by Lukasz Strzygowski as part of the atfify
GSoC 2008 project. These were originally inside the kernel subdirectory
but I think they belong in their own top-level directory because ipf
consists of more components than just the kernel-level packet filter.

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