NS-3 port conflicts with CARLA Server Port

[kjrush]

When run together in co-simulation NS-3 attempts to bind to the same port as the CARLA API server, causing a port conflict and crash shortly after starting the co-simulation. This should be resolved by reconfiguring NS-3 and/or CARLA to use different ports that do not conflict.

Affected version:
Current develop branch as of time of issue writing. Will be documented as a known issue for XIL 1.0 release.

Steps to Reproduce:

1. Build and install the co-simulation images
2. Configure or acquire a scenario file for the cosimulation runtime that instantiates both the carla federate and the ns-3 federate.
3. Run the co-simulation.
4. The system should error out and crash after a brief delay.

Workaround:
For the 1.0 release, the NS-3 adapter will not be enabled in the default XIL co-simulation scenarios. This should not impact the functionality of the co-simulation at 1.0 as only a single vehicle will be involved in this version of the tool. The documentation will be updated to reflect this recommendation.