Fix some issues in tests
modified:   tests/posix-test-suite/pjd-fstest-20080816/tests/mkdir/00.t
modified:   tests/posix-test-suite/pjd-fstest-20080816/tests/rename/00.t
modified:   tests/posix-test-suite/pjd-fstest-20080816/tests/unlink/00.t