Render the configuration as text.

def _config_to_text(self):
        """Render the configuration as text."""
        r = u'' # unicode('',"UTF-8")
        for k in self._config:
            # if k == 'creation_date':
            #     r +=  k + ": " + self._config[k][0] + '\n'
            # else:
            #uk = unicode(k,"UTF-8")
            cosa = '\n        '.join(self._config[k]) + '\n'
            r += k + ": " + cosa
            #r += k + ": " + '\n        '.join(self._config[k]) + '\n'
        r += '\n'
        return r