Ref #467.

@umarcor:
Is it possible to read test_name_to_path_mapping.txt directly as some Python type (dict or list)?

@kraigher:
The file was intended for human use. The format is folder_name SPACE test_name.
I do not recommend that you use it. It is better we add this to --export-json instead.

@kraigher:
Currently the commands are logged if you use --log-level=DEBUG for human use. If an external tool needs this information we need to add it to --export-json.

@umarcor:
IMHO, there should be a simple and realiable programatic procedure to retrieve the output/log of a test. It don't really mind if I need to set some stdout in the python script, or get it as a return field from vu.main(), or parse some output file. I am trying to process test_name_to_path_mapping.txt just because I didn't find a better way to 'see' the content in output.txt.

About adding it to --export-json, although useful, I'd rather avoid it for this specific use case. Using JSON is a better approach when it is to be used from Python, Go, etc. But, with Bash or C I find it easier not to require a JSON parsing library. The current format, as you described it, is straighforward, as one only needs to search for the first space.