[collectd] IPTables Module

[Sjoerd van der Berg]

My first attempt at a module for this is an iptables modules
This will try to read out the rules from iptables for a specific table
and chain.
It will go through the rules looking for ones with "comment" matches
and will use the comment as a base for the generated filename.

So basically looking for lines like
iptables -t mangle -A incoming -p tcp  -m comment --comment "tcp"
will generate a iptables-incoming/tcp.rrd file from the byte counters

There used to also be an account iptables module but that seems to
have been neglected, which would generate /proc entries for specific
rules, don't know what would work better.
Either way, this seems to work somewhat.

tar.gz has a diff, firewall script and the regular files
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