Set testing keep alive timeout to 1 millisecond

If it's too fast, we get stuck trying to send keep alives rather than actually communicating with the peer.

testing.go

@@ -14,7 +14,7 @@ func TestingConfig(t testing.TB) *ClientConfig {
 	cfg.NoDefaultPortForwarding = true
 	cfg.DisableAcceptRateLimiting = true
 	cfg.ListenPort = 0
-	cfg.KeepAliveTimeout = time.Microsecond
+	cfg.KeepAliveTimeout = time.Millisecond
 	//cfg.Debug = true
 	//cfg.Logger = cfg.Logger.WithText(func(m log.Msg) string {
 	//	t := m.Text()