hdfs_fs: fix mode initialization in open_file
hdfs_fs: fix mode initialization in open_file

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