Fix failing py3 tests

This should fix the following integration tests
integration.states.test_file.FileTest.test_directory_clean_require_in
integration.states.test_file.FileTest.test_directory_clean_require_in_with_id
integration.states.test_file.FileTest.test_directory_clean_require_with_name
integration.states.test_file.FileTest.test_recurse_clean
integration.states.test_file.FileTest.test_recurse_clean_specific_env

salt/states/file.py

@@ -644,6 +644,7 @@ def _clean_dir(root, keep, exclude_pat):
     Clean out all of the files and directories in a directory (root) while
     preserving the files in a list (keep) and part of exclude_pat
     '''
+    root = os.path.normcase(root)
     real_keep = _find_keep_files(root, keep)
     removed = set()