Start and sync third monerod for tests
This issue requests configuring a third monerod instance, which syncs with the other two monerod instances for tests.

The config should be added to the [makefile](https://github.com/haveno-dex/haveno/blob/master/Makefile) after `monerod2-local` and sync with monerod1 and monerod2 when started.

The problem is monerod1 and monerod2 are configured to connect with each other exclusively, so the third node doesn't sync.