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The PFring sniffer in Packetbeat is officially unsupported for a longer time,
because it depends on a kernel module and because we don't have a good way of
testing it,
but we left in the code and docs for the people that would like to compile it
themselves. However, it appears that it's broken for a long time (#2800), so this PR
removes it from code and docs.
Closes #4585, #2800.