Currently traefik doesn't see public IPv6 addresses due to docker proxy
and it's work on published ports.
This patch adds a new network for IPv6 traffic which is routed
publically. Therefore traefik should now see incoming traffic properly
on IPv6. Main problem: now there needs to be a separate hostname for
traefik in order to manage IPv4 and IPv6 traffic just for this
The IPv4 address will stay identical to the host's IPv4 address.