This allows debugging of ycmd tests directly using vimspector. I use a
mapping which runs the test under the cursor, so one of the variables it
asks you for it "test" which is essentially arguments to nosetests.

NOTE: It doesn't work on windows, and it requires the use of a
virtualenv at the moment. This is mainly due to a limitation of
vimspector that it only has simple variable replacement in its config.