Running tests from Interact.py requires correct case

[wwahammy]

When running the interact test (https://github.com/qca/boardfarm/blob/master/tests/interact.py), you can press 6 to run a particular test. Right now, you must provide the correct case of the test. In examples like iPerfBiDirTestIPV6, this is pretty easy to make a mistake on. Ideally, you should be able to run the test even if you use the wrong case.

This should be a relatively straightforward fix for someone with a bit of Python experience.