use TrafficManager interface in main

main.go

@@ -336,7 +336,11 @@ func main() {
 		os.Exit(1)
 	}
 
-	iptm := iptables.IPTablesManager{}
+	//Create TrafficManager and instanciate it based on whether we use iptables or nftables
+	var iptm trafficmngr.TrafficManager
+
+	//For now, always use iptables
+	iptm = iptables.IPTablesManager{}
 	// Set up ipMasq if needed
 	if opts.ipMasq {
 		if config.EnableIPv4 {