<!--
Thanks for sending a pull request!
Here are some tips for you:
1. If this is your first time, please read our contributor guidelines: https://kyuubi.readthedocs.io/en/latest/community/contributions.html
2. If the PR is related to an issue in https://github.com/apache/incubator-kyuubi/issues, add '[KYUUBI #XXXX]' in your PR title, e.g., '[KYUUBI #XXXX] Your PR title ...'.
3. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP][KYUUBI #XXXX] Your PR title ...'.
-->
### _Why are the changes needed?_
<!--
Please clarify why the changes are needed. For instance,
1. If you add a feature, you can talk about the use case of it.
2. If you fix a bug, you can clarify why it is a bug.
-->
1. remove the unnecessary scala installation
2. maven compiler log to warn level to filter a lot of annoying message
### _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/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1763 from yaooqinn/ci2.
Closes#1763
c0f11145 [Kent Yao] fix
dfd75dd7 [Kent Yao] fix
01fcc3f1 [Kent Yao] fix
94c62e46 [Kent Yao] Merge branch 'master' of github.com:apache/incubator-kyuubi into ci2
aab62e62 [Kent Yao] fix
b38b52cc [Kent Yao] ci
51cc7db8 [Kent Yao] nit
Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>
38814691b2