In order to configure availability zone[1] for network node we need to add support to edpm_ovn ansible role[2]

It's configured like:- 

ovs-vsctl set Open_vSwitch . external-ids:ovn-cms-options="enable-chassis-as-gw,availability-zones=az-0:az-1:az-2"

[1] https://github.com/openstack/neutron/blob/3bef2ef81ae1b8bd0c8927a9f32c3810eb652b06/doc/source/admin/ovn/availability_zones.rst#L35

 [2] https://github.com/openstack-k8s-operators/edpm-ansible/blob/21a8f62ec1e9de417dad49ff9d01b7d4ba2c1e88/roles/edpm_ovn/tasks/configure.yml#L39