Use geneve instead of vxlan when OVN is enabled

Change-Id: Id3e4e7ca285a94e7270eb4850c66e9094782f841

ansible/inventory/group_vars/all/neutron

@@ -10,13 +10,13 @@ kolla_neutron_ml2_mechanism_drivers:
 kolla_neutron_ml2_type_drivers:
   - flat
   - vlan
-  - vxlan
+  - "{{ 'geneve' if kolla_enable_ovn | bool else 'vxlan' }}"
 
 # List of Neutron ML2 tenant network types to use.
 kolla_neutron_ml2_tenant_network_types:
   - flat
   - vlan
-  - vxlan
+  - "{{ 'geneve' if kolla_enable_ovn | bool else 'vxlan' }}"
 
 # List of Neutron ML2 network VLAN ranges to use. Each item should be a dict
 # containing the following items:

releasenotes/notes/neutron-use-geneve-with-ovn-4d739c90b1aaa3eb.yaml

+---
+upgrade:
+  - |
+    Updates the default Neutron ML2 type drivers and tenant network types to
+    use ``geneve`` instead of ``vxlan`` when OVN is enabled. This affects the
+    ``kolla_neutron_ml2_type_drivers`` and
+    ``kolla_neutron_ml2_tenant_network_types`` variables.