NFQUEUE balancing extension (userspace changes)

[Florian Westphal <fw@strlen.de>]

Hello list,

this adds a new revision of the NFQUEUE target.

In particular, a new "--queue-balance" option, which allows to
specify a range of queues to use.
Packets are then balanced across the given queues by the kernel.

This is useful for multicore systems:
start multiple instances of the userspace program on queues
x, x+1, .. x+n and use "--queue-balance x:x+n".

As for naming, if you'd prefer a different name (or just extend
the existing --queue-num option to accept "firstid:lastid" instead),
please let me know and I'll be happy to change it.

Both paches can also be pulled from
git://git.breakpoint.cc/fw/iptables.git nfq-balance

Thanks for reviewing,
Florian