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### _Why are the changes needed?_
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When run on k8s, engine write hostname to zk. But, server can not connect pod by hostname, we should use ip instead.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/tools/testing.html#running-tests) locally before make a pull request
Closes#663 from hddong/fix-k8s-connect.
Closes#662
385ba6b [hongdongdong] fix test
370201d [hongdongdong] fix comments and add test
736261a [hongdongdong] [KYUUBI #662]Fix run on k8s
Authored-by: hongdongdong <hongdongdong@cmss.chinamobile.com>
Signed-off-by: Kent Yao <yao@apache.org>
b75ea337f6