Improvements for test_py3kwarn - Always show warnings so they are always catchable - Make test_os_path_walk faster by walking a less populous directory
Improvements for test_py3kwarn
- Always show warnings so they are always catchable
- Make test_os_path_walk faster by walking a less populous directory

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator