Update ovn job nodeset similar to ovs job

The job is hitting timeout when running in
non nested nodes as guest vms boots too slow.
Switch nodes to nested-virt like ovs job in order
to resolve it.

Change-Id: I7a758d653116939267ac6f2b74c4ad545e4e051d

zuul.d/base-nested-switch.yaml

@@ -47,6 +47,16 @@
           - compute1
           - compute2
 
+- nodeset:
+    name: whitebox-neutron-single-node-centos-9-stream
+    nodes:
+      - name: controller
+        label: nested-virt-centos-9-stream
+    groups:
+      - name: tempest
+        nodes:
+          - controller
+
 - job:
     name: whitebox-neutron-tempest-plugin-base-nested-switch
     parent: whitebox-neutron-tempest-plugin-base

zuul.d/master_jobs.yaml

@@ -243,7 +243,7 @@
     parent: whitebox-neutron-tempest-plugin-base-nested-switch
     timeout: 10800
     # TODO(mblue): Remove line when changing ovn job to be HA job as well.
-    nodeset: devstack-single-node-centos-9-stream
+    nodeset: whitebox-neutron-single-node-centos-9-stream
     vars:
       network_api_extensions_ovn:
         - vlan-transparent