Make hadut.run_cmd and related fns throw a more informative exception
Make hadut.run_cmd and related fns throw a more informative exception

The previous mechanism doesn't provide a way to see the command's return
code.  This commit should be backwards compatible but add the additional
information.

elzaggo/pydoop,elzaggo/pydoop,kikkomep/pydoop,kikkomep/pydoop,simleo/pydoop,mdrio/pydoop,ilveroluca/pydoop,crs4/pydoop,kikkomep/pydoop,simleo/pydoop,simleo/pydoop,kikkomep/pydoop,ilveroluca/pydoop,mdrio/pydoop,ilveroluca/pydoop,ilveroluca/pydoop,simleo/pydoop,kikkomep/pydoop,crs4/pydoop,simleo/pydoop,crs4/pydoop,elzaggo/pydoop,mdrio/pydoop,crs4/pydoop,mdrio/pydoop,ilveroluca/pydoop,elzaggo/pydoop,mdrio/pydoop,crs4/pydoop,elzaggo/pydoop