Comment 1 for bug 1578897

Not sure if I should be the owner since I did most of the later work on this change.

The change on docs.openstack.org really just need to mention either address family is possible, I didn't actually find any place where it said "IPv4 only". So matching the config.py change I made the setting could be described like this:

local_ip - Local IP address of tunnel endpoint. Can be either an IPv4 or IPv6 address.