Read the configuration files.

def read_config(self):
        """
        Read the configuration files.
        """

        try:
            parsed_files = self._config.read(self._files, encoding="utf-8")
        except configparser.Error as e:
            log.error("Can't parse configuration file: %s", str(e))
            return
        if not parsed_files:
            log.warning("No configuration file could be found or read")
        else:
            for file in parsed_files:
                log.info("Load configuration file {}".format(file))
                self._watched_files[file] = os.stat(file).st_mtime