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### _Why are the changes needed?_
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Remove redundant unit. `MB`
```
2021-09-23 08:41:08.889 INFO spark.SparkSQLEngine:
Spark application name: kyuubi_USER_root_6f67c12c-f362-4a07-87d0-7aa7e5f43171
application ID: spark-461363e9cc934d1986f7ae4191dc0410
application web UI: http://spark-740a727c11ce3da7-driver-svc.default.svc:44692
master: k8s://https://10.10.9.35:6443
version: 3.1.2
driver: [cpu: 1, mem: 1G]
executor: [cpu: 2, mem: 2G MB, maxNum: 18]
Start time: Thu Sep 23 08:40:39 UTC 2021
User: root (shared mode: USER)
State: LATENT
```
### _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#1141 from timothy65535/remove.
Closes#1141
af1827e9 [timothy65535] Remove redundant unit
Authored-by: timothy65535 <timothy65535@163.com>
Signed-off-by: ulysses-you <ulyssesyou@apache.org>
d93a6c8b5b