[CI] Use ovs-vsctl to ensure bridges

The upstream openvswitch collection has been deprecated and was not
included in newer Ansible (like Ansible 11). Since jobs switched
to Ansible jobs relying on these tasks are failing.

This patch switches to use ovs bridge command same
as add-port in next tasks.

Also add the role to irrelevant-files as single node
jobs need not run on multi node role changes.

Depends-On: https://review.opendev.org/c/x/devstack-plugin-tobiko/+/958046
Change-Id: I87372ad19f3b9c054e2a047ba9925a3ba0d6e503
Signed-off-by: Yatin Karel <ykarel@redhat.com>

roles/multi-node-setup/tasks/main.yaml

@@ -5,13 +5,13 @@
 
   - name: Ensure the infra bridge exists
     become: yes
-    openvswitch_bridge:
-      bridge: "{{ infra_bridge_name }}"
+    command: >-
+      ovs-vsctl --may-exist add-br {{ infra_bridge_name }}
 
   - name: Ensure the Neutron external bridge exists
     become: yes
-    openvswitch_bridge:
-      bridge: "{{ neutron_external_bridge_name }}"
+    command: >-
+      ovs-vsctl --may-exist add-br {{ neutron_external_bridge_name }}
 
   - name: Create patch port between bridges
     become: yes