only inc iptables conf with iptables-persistent

tasks/firewall.yml

@@ -74,6 +74,7 @@
       ansible.builtin.include_tasks: iptables.yml
       when:
         - icinga_port_state != "open"
+        - ( "iptables-persistent" in ansible_local.dpkg.installed )
         - ( "ufw" not in ansible_local.dpkg.installed )
 
     - name: Include the UFW role when port 5665 is not open on the agent mode