Restrict tenant network to geneve

OVN doesn't support VXLAN networks. VLAN tenant networks
have limitations and should be blocked till they are fixed.
So we restrict tenant network to geneve.

Change-Id: I4cabde39c252a605d769e137ae402f6fbc5a3041
Closes-Bug: 1767070

puppet/services/neutron-plugin-ml2-ovn.yaml

@@ -71,6 +71,17 @@ parameters:
     description: Whether Metadata Service has to be enabled
     type: boolean
     default: true
+  # NOTE(anil): OVN supports only VLAN and geneve networks. But VLAN
+  # tenant networks have a limited support in OVN. So allowing only
+  # geneve networks until the problems are addressed.
+  # See bug #1767070 for more information.
+  NeutronNetworkType:
+    default: 'geneve'
+    description: The tenant network type for Neutron.
+    type: comma_delimited_list
+    constraints:
+      - allowed_values:
+          - geneve
 
 resources:
 
@@ -101,6 +112,7 @@ outputs:
             neutron::server::qos_notification_drivers: {get_param: OVNQosDriver}
             neutron::plugins::ml2::max_header_size: {get_param: NeutronGeneveMaxHeaderSize}
             neutron::plugins::ml2::ovn::dvr_enabled: {get_param: NeutronEnableDVR}
+            neutron::plugins::ml2::tenant_network_types: {get_param: NeutronNetworkType}
       step_config: |
         include ::tripleo::profile::base::neutron::plugins::ml2
       metadata_settings:

tools/yaml-validate.py

@@ -110,6 +110,16 @@ PARAMETER_DEFINITION_EXCLUSIONS = {'CephPools': ['description',
                                    'BondInterfaceOvsOptions': ['description',
                                                                'default',
                                                                'constraints'],
+                                   # NOTE(anil): This is a temporary change and
+                                   # will be removed once bug #1767070 properly
+                                   # fixed. OVN supports only VLAN and geneve
+                                   # for NeutronNetworkType. But VLAN tenant
+                                   # networks have a limited support in OVN.
+                                   # Till that is fixed, we restrict
+                                   # NeutronNetworkType to 'geneve'.
+                                   'NeutronNetworkType': ['description',
+                                                          'default',
+                                                          'constraints'],
                                    'KeyName': ['constraints'],
                                    'OVNSouthboundServerPort': ['description'],
                                    'ExternalInterfaceDefaultRoute':