Change _run_process() to use builtin timeout parameter
Change _run_process() to use builtin timeout parameter

NOTE: this change breaks Python 2 compatability: subprocess.check_call does not
take a timeout argument in Python 2.7

Rafiot/PyCIRCLean,CIRCL/PyCIRCLean,Rafiot/PyCIRCLean,CIRCL/PyCIRCLean