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### _Why are the changes needed?_
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Add UT for engine deregister exception
### _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
- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/tools/testing.html#running-tests) locally before make a pull request
Closes#558 from turboFei/KYUUBI-544-exception-test.
Closes#544
7812d6e [fwang12] remove blank line
3b5252a [fwang12] find cause
6e09907 [fwang12] simplify ut
dbafab2 [fwang12] log ve
b062503 [fwang12] improvement
0793980 [fwang12] fix ut
ac35be0 [fwang12] [KYUUBI #544][TEST] Add ut for engine deregister exception
Authored-by: fwang12 <fwang12@ebay.com>
Signed-off-by: Kent Yao <yao@apache.org>
29e169b68b