Ensure we have the ansible "interfaces" fact

It might happen this role isn't called without any fact gathering, for
instance running plain "ansible -m include_role -a role=tripleo_podman".

This small addition ensures we actually collect the needed things before
usage.

Change-Id: I2de4088bb3e9f3e049632f7d593a6ca8a2ac00de

tripleo_ansible/roles/tripleo_podman/tasks/tripleo_podman_install.yml

@@ -26,6 +26,15 @@
         name: "{{ tripleo_podman_packages }}"
         state: latest
 
+    - name: Ensure we get the ansible_interfaces fact
+      when:
+        - ansible_interfaces is undefined
+      setup:
+        gather_subset:
+          - '!all'
+          - '!min'
+          - 'interfaces'
+
     - name: Delete legacy cni0 interface (podman < 1.6)
       command: ip link delete cni0
       when: