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### _Why are the changes needed?_
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#751
### _How was this patch tested?_
- [x] 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#752 from wForget/dev.
Closes#751
ae9dc873 [wForget] [KYUUBI #751] Support single session mode
Authored-by: wForget <643348094@qq.com>
Signed-off-by: Kent Yao <yao@apache.org>
9654a936d2