fix not-found service error (#10391)

Signed-off-by: tu1h <lihai.tu@daocloud.io>

contrib/os-services/roles/prepare/tasks/main.yml

@@ -12,7 +12,7 @@
       state: stopped
       enabled: no
     when:
-      "'firewalld.service' in services"
+      "'firewalld.service' in services and services['firewalld.service'].status != 'not-found'"
 
   - name: Disable service ufw
     systemd:
@@ -20,4 +20,4 @@
       state: stopped
       enabled: no
     when:
-      "'ufw.service' in services"
+      "'ufw.service' in services and services['ufw.service'].status != 'not-found'"