Creates the arg parsers needed for the compare command.

def add_list_blocks_parser(subparsers, parent_parser):
    """Creates the arg parsers needed for the compare command.
    """
    parser = subparsers.add_parser(
        'list-blocks',
        help='List blocks from different nodes.',
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog='',
        parents=[parent_parser, base_multinode_parser()])

    parser.add_argument(
        '-n',
        '--count',
        default=10,
        type=int,
        help='the number of blocks to list')