Fix issue #757

Fix not correct host in "Now listening on:" message when using iris.Listener

Former-commit-id: a4f071e936c86a425a84986285625de542bb6d33

iris.go

@@ -470,7 +470,7 @@ type Runner func(*Application) error
 func Listener(l net.Listener, hostConfigs ...host.Configurator) Runner {
 	return func(app *Application) error {
 		app.config.vhost = netutil.ResolveVHost(l.Addr().String())
-		return app.NewHost(new(http.Server)).
+		return app.NewHost(&http.Server{Addr: l.Addr().String()}).
 			Configure(hostConfigs...).
 			Serve(l)
 	}