podman/systemd: relax the "until" condition

On slow systems, it's possible that systemd takes more time than usual
to execute a task from Ansible (e.g. service restart); so Ansible
doesn't have yet the registered facts from systemd.

To make sure that Ansible doesn't fail with:
dict object' has no attribute 'status'

We first check if status is defined.

Change-Id: Ie73cecc115c87fe452a90892755a1df5b3d894a7
Closes-Bug: #1877449

tripleo_ansible/roles/tripleo_container_manage/tasks/podman/systemd.yml

@@ -60,6 +60,6 @@
   loop_control:
     loop_var: container_sysd_name
   register: systemd_service_enable
-  until: systemd_service_enable.status.Result == "success"
+  until: (systemd_service_enable.status is defined) and (systemd_service_enable.status.Result == "success")
   retries: 5
   delay: 5