Add ep_retry code.
Fix small bugette in handling of endpoint retry.
Stop using "state" completely - "conntrack" seems more reliable.
Fix up bug where we created IPv6 sets as IPv4, then crashed.
GETACLUPDATE response may arrive before tap interface created; handle it.
Speculative fix for problem with icmp ip6tables rules.
Do not get confused during second resync and delete endpoints.
Merge pull request #21 from Metaswitch/plw

Today's testing