Build: Multithread IDL Tests

[WhoBrokeTheBuild]

First attempt at multithreading the IDL tests

TODO: The write tests still need a way to access mdsip, and now in parallel We'll probably use different shot numbers or something to that effect

This also moves the testid variable out of IDL and turns it into a parameter to each test This lets us name the threads and output log files for each test individually

TODO: Output a JUnit XML to allow Jenkins to track these tests