Load the configuration from specified files.

def load_config(files=None, root_path=None, local_path=None):
    """Load the configuration from specified files."""

    config = cfg.ConfigOpts()
    config.register_opts([
        cfg.Opt('root_path', default=root_path),
        cfg.Opt('local_path', default=local_path),
    ])
    # XXX register actual config groups here
    # theme_group = config_theme.register_config(config)
    if files is not None:
        config(args=[], default_config_files=files)
    return config