Remove support for multi-vehicles from ros bridge.

[fs-driverless]

Remove support for multi-vehicles from ros bridge.

[SijmenHuizenga]

When running multiple vehicles simultaneously, each autonomous system will have it's own ros core. A single ros node cannot connect to multiple ros cores. Thus we will need a ros bridge for each AS. Therefore I think we can remove multi-vehicle support from the ros-bridge.

You might be right that the future comes faster then we can imagine. Let's not actively remove multi-vehicle support in the AirSim plugin.

[davidoort]

I agree that within the next 5 years FS Driverless vehicles will not be allowed to race on the same track, but I think that in sim this might begin to happen next year. I would refrain from removing this support unless it introduces a lot of complexity in some places (so far the only additional complexity I have observed is some additional for loops and passing around 1 element vectors instead of a single object) or performance issues

[SijmenHuizenga]

Ros bridge no longer supports multiple vehicles.