Comment 5 for bug 1741575

not that ip_allocation=None was originally not supported intentornally
due to security concerns.

it was declared out of scope in
https://specs.openstack.org/openstack/nova-specs/specs/newton/implemented/neutron-routed-networks.html#proposed-change

i personaly am not confrotable treating this as jsut a bug fix without first checking
with the wider nova core team so i am not going to triage this as a valid bug untill i
discuss it futther on irc.