Make vlan_transparent in neutron.conf configurable from Undercloud

Allow plugins that support it to create VLAN transparent networks
The vlan_transparent determines if plugins that support it to
create VLAN transparent networks or not

Depends-On: I149237c12658201e44efdb1cd4851c7f154c6728
Change-Id: I2472fff376c172070d22d6dd90664145ab9d850e
Closes-Bug: 1786409

puppet/services/neutron-base.yaml

@@ -116,6 +116,12 @@ parameters:
         Messaging client subscriber parameter to specify
         an SSL connection to the messaging host.
     type: string
+  EnableVLANTransparency:
+    default: false
+    description: >
+        If True, then allow plugins that support it to create VLAN
+        transparent networks.
+    type: boolean
 
 conditions:
   dhcp_agents_zero: {equals : [{get_param: NeutronDhcpAgentsPerNetwork}, 0]}
@@ -153,6 +159,7 @@ outputs:
             neutron::db::sync::db_sync_timeout: {get_param: DatabaseSyncTimeout}
             neutron::global_physnet_mtu: {get_param: NeutronGlobalPhysnetMtu}
             neutron::db::sync::extra_params: {get_param: NeutronDBSyncExtraParams}
+            neutron::vlan_transparent: {get_param: EnableVLANTransparency}
           - if:
             - dhcp_agents_zero
             - {}

releasenotes/notes/add-vlan_transparent-config-5623f8cffc8b41f0.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - Allow plugins that support it to create VLAN transparent networks
+    The vlan_transparent determines if plugins that support it to
+    create VLAN transparent networks or not