samples/tools/testbed/run_scenarios.py prepare the run script fails in windows environment

[garyfollett]

the run.sh will fail in the docker container in a windows environment if newline='\n' is not included in the call.

with open(os.path.join(work_dir, "run.sh"), "wt", newline='\n') as f:

[afourney]

Thanks for the report. I'll fix this ASAP, and include the fix in all cases where a file is written by the host OS, and read in the Docker image (I suspect that is the incompatibility here)

[afourney]

@garyfollett I believe I have addressed this in PR #678

Please have a look and let us know if it works for you.