internal function to call get_log_content

def log_internal(args, filetype):
    '''internal function to call get_log_content'''
    file_name = get_config_filename(args)
    if filetype == 'stdout':
        file_full_path = os.path.join(NNICTL_HOME_DIR, file_name, 'stdout')
    else:
        file_full_path = os.path.join(NNICTL_HOME_DIR, file_name, 'stderr')
    print(check_output_command(file_full_path, head=args.head, tail=args.tail))