IP v6 support and minor bug fixes.
Minor logging enhancement.
Fix dull bug where we never left long enough for resync responses to
return on a slow system, ignoring the config values.
Many more updates. Apart from intermittent iptables issues, mostly
working well. Next action is to fix those.
Finally fix dull issue with python-iptables, state and IPv6.
Merge pull request #20 from Metaswitch/plw

Neil - can you please take a look at this, and merge when you are happy with it. Thanks.