Comment 5 for bug 2055447

Separately, it would be really nice if "default_availability_zones" could be defined as well. Maybe the variable does work when I use "neutron_default_availability_zones" or something like that, but I've found no reference to it. This parameter goes into neutron.conf, and I suggest by default it matches the neutron_ovn_availability_zones (comma separated instead of colon separated)