fix multiple problems in cli_test

[spoonincode]

Fixes multiple issues I've encountered with cli_test:

• don't assume builddir is a subdirectory of sourcedir, resolves cli_test assumes build directory is subdirectory of source directory #30. All the needed files are already in the builddir so this is literally just removing a needless ..
• remove a deceptive print() of an error. It's always an error and it's intended to be an error
• use makedirs() to ensure all parent directories are created. This is needed when the test if the first (or only) test to run, such as when running all the tests in parallel. Otherwise the var/ directory doesn't exist and the test errors out.