Add support for Ironic Rpc Transport override

Related-Blueprint: undercloud-minion

Change-Id: I24d6d2e220fd99a9d9ae99e1bfbf31da1423bc3a
Signed-off-by: Bogdan Dobrelya <bdobreli@redhat.com>

deployment/ironic/ironic-base-puppet.yaml

@@ -48,6 +48,13 @@ parameters:
     description: The password for the Ironic service and db account, used by the Ironic services
     type: string
     hidden: true
+  IronicRpcTransport:
+    description: The remote procedure call transport between conductor and
+                 API processes, such as a messaging broker or JSON RPC.
+    default: ''
+    type: string
+    constraints:
+      - allowed_values: [ '', 'oslo', 'json-rpc']
   RpcPort:
     default: 5672
     description: The network port for messaging backend
@@ -83,6 +90,7 @@ parameter_groups:
 conditions:
   service_debug_unset: {equals : [{get_param: IronicDebug}, '']}
   default_rsc_unset: {equals : [{get_param: IronicDefaultResourceClass}, '']}
+  rpc_transport_unset: {equals : [{get_param: IronicRpcTransport}, '']}
 
 outputs:
   role_data:
@@ -112,5 +120,10 @@ outputs:
           - default_rsc_unset
           - {}
           - ironic::default_resource_class: {get_param: IronicDefaultResourceClass}
+        -
+          if:
+          - rpc_transport_unset
+          - {}
+          - ironic::rpc_transport: {get_param: IronicRpcTransport}
       step_config: |
         include ::tripleo::profile::base::ironic

releasenotes/notes/ironic-rpc-transport-b637fd2a3b99fee7.yaml

@@ -0,0 +1,11 @@
+---
+features:
+  - |
+    `IronicRpcTransport` controlls the remote procedure call transport between
+    Ironic Conductor and API processes. For some case, like Edge DCN, this
+    parameter may be set to 'json-rpc', when the used messaging broker should
+    not be stretched over WAN. For such cases, this option also plays nicely
+    alongside the
+    `Ironic Conductor Groups <https://docs.openstack.org/ironic/latest/admin/conductor-groups.html>`_
+    feature. Defaults to an empty value, which leaves the corresponding
+    service's default value intact.