Parse the config with the given options.

def parse_config(config, key, options):
        """Parse the config with the given options."""
        conf = {}
        for source, destination, opt_type in options:
            opt_value = _get_opt(config, key, source, opt_type)
            if opt_value is not None:
                _set_opt(conf, destination, opt_value)
        return conf