Fix the bytes_to_native_str test on Py3
Fix the bytes_to_native_str test on Py3

michaelpacer/python-future,krischer/python-future,michaelpacer/python-future,krischer/python-future,QuLogic/python-future,PythonCharmers/python-future,PythonCharmers/python-future,QuLogic/python-future