Added python3 compatibility to the dir walker.
Added python3 compatibility to the dir walker.

elzaggo/pydoop,elzaggo/pydoop,simleo/pydoop,crs4/pydoop,elzaggo/pydoop,simleo/pydoop,simleo/pydoop,crs4/pydoop,simleo/pydoop,simleo/pydoop,crs4/pydoop,crs4/pydoop,elzaggo/pydoop,elzaggo/pydoop,crs4/pydoop