def tearDown(self):
        super(SimpleInstanceTest, self).tearDown()
        CONF.network_label_regex = self.orig_conf
        CONF.ip_start = None
def deserialize(self, value):
        value = decode(value).strip()
        validators.validate_required(value, self._required)
        if not value:
            return None
        validators.validate_choice(value, self._choices)
        return value