fetch and parse config file

    Args:
        config_filepath (str): path to config file.  abspath > relpath
        logger (:obj:`logging.Logger`): logger to catch error msgs

def read_config(
        config_filepath,
        logger=logging.getLogger('ProsperCommon'),
):
    """fetch and parse config file

    Args:
        config_filepath (str): path to config file.  abspath > relpath
        logger (:obj:`logging.Logger`): logger to catch error msgs

    """
    config_parser = configparser.ConfigParser(
        interpolation=ExtendedInterpolation(),
        allow_no_value=True,
        delimiters=('='),
        inline_comment_prefixes=('#')
    )
    logger.debug('config_filepath=%s', config_filepath)

    with open(config_filepath, 'r') as filehandle:
        config_parser.read_file(filehandle)

    return config_parser