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### _Why are the changes needed?_
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When HADOOP_HOME is not set, the stop-application.sh script cannot kill the yarn task even if the yarn command exists. #1649
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [X] Add screenshots for manual tests if appropriate
- [X] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1650 from wForget/KYUUBI-1649.
Closes#1649
aa8c08d8 [wForget] change error msg
4ec523be [wForget] [KYUUBI-1649] Determine the yarn command in stop-application.sh.
Authored-by: wForget <643348094@qq.com>
Signed-off-by: ulysses-you <ulyssesyou@apache.org>
92163dda42
