libvirt: Restart libvirtd with iptables to fix NAT network rules

libvirt/manifests/init.pp

@@ -117,9 +117,16 @@ class libvirt::kvm inherits libvirt::client {
         notify  => Service["libvirtd"],
     }
 
-    service { "libvirtd":
-        ensure => running,
-        enable => true,
+    if defined(Service["iptables"]) {
+        $iptables = Service["iptables"]
+    } else {
+        $iptables = undef
     }
-}
 
+    service { "libvirtd":
+        ensure    => running,
+        enable    => true,
+        subscribe => $iptables,
+    }
+
+}