Possibility of deadlock in RTI discovery

[erlingrj]

If some other unrelated process already has opened port 15045 then the federates might block forever waiting for an ACK from this other process. There needs to be a timeout in waiting for the ACK from RTI. In case of a timeout we must try another port.

An easier approach is to treat it as an error condition if the RTI is not able to open its designated port.