Append the parser arguments for the 'system' commands

def define_system_args(subparsers):
    """Append the parser arguments for the 'system' commands"""
    system_parser = subparsers.add_parser("system", help='Available commands: \'info\'')
    system_subparsers = system_parser.add_subparsers(help='System commands')

    # system info arguments
    info_parser = system_subparsers.add_parser('info', help='Get system status information')
    info_parser.add_argument('--src', required=True, dest='src', metavar='src',
                             help='The instance name of the target SDC (must match the name in sdc-hosts.yml)')
    info_parser.set_defaults(func=info_command)