Fix removal of 'noaccess' test directory
Fix removal of 'noaccess' test directory

Add rwx permission for 'noaccess' test dir, to allow recursive deletion
to succeed (needs read access in order to check if directory is empty; a
non-empty directory would also need at least write access).

os.RemoveAll() fails on at least MacOs without re-enabling these
permissions before attempting to remove 'noaccess' dir.

karrick/godirwalk,karrick/godirwalk