src/nf-queue.c: cleanup and improve performance of test program for NF_QUEUE

* Fix filename in file header

* If the kernel or netlink socket becomes over loaded,
  the kernel starts printing error messages like:

nf_queue: full at 1024 entries, dropping packets(s). Dropped: 1
nf_queue: full at 1024 entries, dropping packets(s). Dropped: 2
nf_queue: full at 1024 entries, dropping packets(s). Dropped: 3

So detect out of order packet ID's and set the NF_ACCEPT verdictÂ,
so they will be removed from the kernel queue.

* increase socket buffer to improve performance

without these changes sending more than 100 KB/s over tcp HTTP lo(localhost)
was difficult on my core2 duo machine, due to so many dropped packets.
After these changes over 150 MB/s was easy.

* improve help text

Signed-off-by: Karl Hiramoto <karl@hiramoto.org>

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