ooni-probe/bridget should make sure that random port numbers are not already taken
The bridget plugin of ooni-probe generates random Control and SOCKS ports between 49152 and 65535 and a random Tor data directory containing an int between 0 and 424242424242. The ports are problematic here, because Tor won't start if a port is already in use. We already ran into this case. The plugin should make sure that a port number wasn't picked before, or it will conclude that a bridge is offline when it may be reachable. The directory name generation could also be improved, e.g., by using an internal counter.