Creates the arg parsers needed for the genesis command.

def add_genesis_parser(subparsers, parent_parser):
    """Creates the arg parsers needed for the genesis command.
    """
    parser = subparsers.add_parser(
        'genesis',
        help='Creates the genesis.batch file for initializing the validator',
        description='Generates the genesis.batch file for '
        'initializing the validator.',
        epilog='This command generates a serialized GenesisData protobuf '
        'message and stores it in the genesis.batch file. One or more input '
        'files (optional) can contain serialized BatchList protobuf messages '
        'to add to the GenesisData. The output shows the location of this '
        'file. By default, the genesis.batch file is stored in '
        '/var/lib/sawtooth. If $SAWTOOTH_HOME is set, the location is '
        '$SAWTOOTH_HOME/data/genesis.batch. Use the --output option to change '
        'the name of the file.',
        parents=[parent_parser])

    parser.add_argument(
        '-o', '--output',
        type=str,
        help='choose the output file for GenesisData')

    parser.add_argument(
        'input_file',
        nargs='*',
        type=str,
        help='file or files containing batches to add to the resulting '
        'GenesisData')