test.check_whitespace.get_issues not being used correctly.

This checkin expanded the scope of the check_whitespace function https://gitweb.torproject.org/stem.git/commit/c1450e440e388295a329e84b3e935bf86f88e673

However the arg passed can only be a path, not a filename so the 3rd line of this checkin has no effect. https://gitweb.torproject.org/stem.git/blobdiff/c52042c44b5a157dceb6013743fdea40bbc3f52c..c1450e440e388295a329e84b3e935bf86f88e673:/run_tests.py

A easier approach would be to scan all python files in the project? I've made this change here: https://github.com/eoinof/stem/commit/5c64a755590a275265665cf082a2fc928ac0972b#run_tests.py

And fixed 2 whitespace issues in run_tests.py here: https://github.com/eoinof/stem/commit/b458b667913f4b4e89fb1d11afea68a15fef3f84#run_tests.py

Trac:
Username: eoinof