def tearDown(self):
        super(SimpleInstanceTest, self).tearDown()
        CONF.network_label_regex = self.orig_conf
        CONF.ip_start = None
def line(self, x, y, length, horizontal):
		if horizontal:
			self.board[y,x:x+length] = self.color
		else:
			self.board[y:y+length,x] = self.color