Fix WalkTests.test_traversal() on Windows.  The cleanup in MakedirTests.setUp() can now be removed.
Fix WalkTests.test_traversal() on Windows.  The cleanup in
MakedirTests.setUp() can now be removed.

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