Add neutron_ovn_availability_zones parameter

With the new ``neutron_ovn_availability_zones`` parameter it is possible
to define network availability zones for OVN. Further details can be found
in the Neutron OVN documentation:
https://docs.openstack.org/neutron/latest/admin/ovn/availability_zones.html#how-to-configure-it

Change-Id: I203e0d400a3218d0b4a41f2a948207032c4febec

ansible/group_vars/all.yml

@@ -1012,6 +1012,9 @@ neutron_sriov_physnet_mappings:
   sriovnet1: "{{ tunnel_interface }}"
 neutron_enable_tls_backend: "{{ kolla_enable_tls_backend }}"
 
+# Set OVN network availability zones
+neutron_ovn_availability_zones: []
+
 #######################
 # Nova options
 #######################

ansible/roles/ovn-controller/tasks/setup-ovs.yml

@@ -14,7 +14,7 @@
   vars:
     ovn_mappings: "{% for bridge in neutron_bridge_name.split(',') %}physnet{{ loop.index0 + 1 }}:{{ bridge }}{% if not loop.last %},{% endif %}{% endfor %}"
     ovn_macs: "{% for bridge in neutron_bridge_name.split(',') %}physnet{{ loop.index0 + 1 }}:{{ ovn_base_mac | random_mac(seed=inventory_hostname + bridge) }}{% if not loop.last %},{% endif %}{% endfor %}"
-    ovn_cms_opts: "{{ 'enable-chassis-as-gw' if inventory_hostname in groups['ovn-controller-network'] else '' }}"
+    ovn_cms_opts: "{{ 'enable-chassis-as-gw' if inventory_hostname in groups['ovn-controller-network'] else '' }}{{ ',availability-zones=' + neutron_ovn_availability_zones | join(',') if inventory_hostname in groups['ovn-controller-network'] and neutron_ovn_availability_zones }}"
   become: true
   kolla_toolbox:
     container_engine: "{{ kolla_container_engine }}"

releasenotes/notes/neutron_ovn_availability_zones-0271d74dbc4f957e.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    With the new ``neutron_ovn_availability_zones`` parameter it is possible
+    to define network availability zones for OVN. Further details can be found
+    in the Neutron OVN documentation:
+    https://docs.openstack.org/neutron/latest/admin/ovn/availability_zones.html#how-to-configure-it