Check if ufw is installed before attempting to disable it (#807)

Co-authored-by: Devin Buhl <onedr0p@users.noreply.github.com>

ansible/playbooks/cluster-prepare.yml

@@ -71,6 +71,10 @@
             enabled: false
             masked: true
             state: stopped
+          register: stop_service
+          failed_when:
+            - stop_service.failed == true
+            - '"Could not find the requested service" not in stop_service.msg'
         - name: System Configuration (1) | Enable fstrim
           ansible.builtin.systemd:
             service: fstrim.timer