Update to the tests from 5.1.1

Back out the recent import of IPFilter 5.1.1 for the upcoming branch,
which will now have IPFilter 4.1.34. IPFilter 5.1.1 will be restored
post-branch.

ok: core, releng.

Update ipf test suite with test cases from IPFilter 5.1.1

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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