Add Facter fact that provides versions for "iptables", "ebtables" and "arptables".
Add Facter fact that provides versions for "iptables", "ebtables" and "arptables".

This fact will provide version number details for "iptables" (including "ip6tables"
as this is the same package in 99% of cases), "ebtables" and "arptables".

Signed-off-by: Krzysztof Wilczynski <9bf091559fc98493329f7d619638c79e91ccf029@linux.com>

benedikt-wegmann/facter-facts,kwilczynski/facter-facts