Returns the create_time of a Process instance.

    It's backward compatible with < 2.0 versions of psutil.

def _get_proc_create_time(proc):
    '''
    Returns the create_time of a Process instance.

    It's backward compatible with < 2.0 versions of psutil.
    '''
    try:
        return salt.utils.data.decode(proc.create_time() if PSUTIL2 else proc.create_time)
    except (psutil.NoSuchProcess, psutil.AccessDenied):
        return None