Add NeutronOverlayIPVersion parameter to neutron-plugins-ml2 service

This patch adds NeutronOverlayIPVersion parameter to congfigure
neutron ML2 overlay_ip_version option from T-H-T. puppet-neutron
already has support for configuration of this option, we are just
exposing it from T-H-T. This parameter needs to be set to '6' when
IPv6 vxlan tunnel endpoints are desired.

Closes-Bug: #1691213

Change-Id: I056afa25f67a3b6857bdfef14e6d582b0a9e5e93
Signed-off-by: Feng Pan <fpan@redhat.com>

puppet/services/neutron-plugin-ml2.yaml

@@ -76,6 +76,12 @@ parameters:
     description: Firewall driver for realizing neutron security group function
     type: string
     default: 'openvswitch'
+  NeutronOverlayIPVersion:
+    default: 4
+    description: IP version used for all overlay network endpoints.
+    type: number
+    constraints:
+    - allowed_values: [4,6]
 resources:
 
   NeutronBase:
@@ -105,6 +111,7 @@ outputs:
             neutron::plugins::ml2::vni_ranges: {get_param: NeutronVniRanges}
             neutron::plugins::ml2::tenant_network_types: {get_param: NeutronNetworkType}
             neutron::plugins::ml2::firewall_driver: {get_param: NeutronFirewallDriver}
+            neutron::plugins::ml2::overlay_ip_version: {get_param: NeutronOverlayIPVersion}
 
       step_config: |
         include ::tripleo::profile::base::neutron::plugins::ml2

releasenotes/notes/neutron-ml2-overlay-ip-version-4f14932355847aa0.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - Add NeutronOverlayIPVersion parameter to congfigure neutron ML2
+    overlay_ip_version option. This parameter should be set to 6 when user
+    requires tenant vxlan tunnel endpoints to be IPv6.