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### _Why are the changes needed?_
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We don't support isolation, so it's unnecessary to print isolation level.
before this PR
```
Connected to: Spark SQL (version 1.4.0-SNAPSHOT)
Driver: Kyuubi Project Hive JDBC Shaded Client (version 1.4.0-SNAPSHOT)
Transaction isolation: TRANSACTION_REPEATABLE_READ
Beeline version 1.4.0-SNAPSHOT by Apache Kyuubi
```
After:
```
Connected to: Apache Kyuubi (Incubating) (version 1.4.0-SNAPSHOT)
Driver: Kyuubi Project Hive JDBC Shaded Client (version 1.4.0-SNAPSHOT)
Beeline version 1.4.0-SNAPSHOT by Apache Kyuubi (Incubating)
```
### _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#1421 from ulysses-you/improve-log.
Closes#1421
2e0e168e [ulysses-you] improve
Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: fwang12 <fwang12@ebay.com>
fda295865e