def tearDown(self):
        super(SimpleInstanceTest, self).tearDown()
        CONF.network_label_regex = self.orig_conf
        CONF.ip_start = None
def _exit_modes_beyond(self, thisMode):
        if not self.modeList: return
        while len(self.modeList) > thisMode + 1: 
            self.modeList.pop().exit()