Fix infra node support on libvirt

playbooks/libvirt/openshift-cluster/launch.yml

@@ -42,7 +42,7 @@
       count: "{{ num_infra }}"
   - include: tasks/launch_instances.yml
     vars:
-      instances: "{{ infra_names }}"
+      instances: "{{ node_names }}"
       cluster: "{{ cluster_id }}"
       type: "{{ k8s_type }}"
       g_sub_host_type: "{{ sub_host_type }}"