8fc83e4e69
### _Why are the changes needed?_
The current option `-n` of command `kyuubi-ctl create` is confusing for new users. For example, when using the below command without setting `kyuubi.ha.zookeeper.namespace` it throws following exception which seems confused:
```
$ bin/kyuubi-ctl create -s localhost -p 10009 -n test
Only support expose Kyuubi server instance to another domain, but the default
namespace is [None] and specified namespace is [test]
at org.apache.kyuubi.ctl.ServiceControlCliArguments.fail(ServiceControlCliArguments.scala:294)
at org.apache.kyuubi.ctl.ServiceControlCliArguments.validateCreateActionArguments(ServiceControlCliArguments.scala:195)
at org.apache.kyuubi.ctl.ServiceControlCliArguments.validateArguments(ServiceControlCliArguments.scala:176)
at org.apache.kyuubi.ctl.ServiceControlCliArguments.parse(ServiceControlCliArguments.scala:136)
at org.apache.kyuubi.ctl.ServiceControlCliArguments.<init>(ServiceControlCliArguments.scala:36)
...
```
In addtion, the description of option `-n` in `kyuubi-ctl --help` is `using kyuubi-defaults/conf if absent`, however when using below without option `-n` throws like:
```
$ bin/kyuubi-ctl create -s localhost -p 10009
Zookeeper namespace is not specified
...
```
this because the default value is not copied to `cli.args` for `create` action. Users may confuse about this.
### _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 #1523 from murong00/branch-1523.
Closes #1523
2439d467 [sunfangbin] Refine usage about option '--namespace' in kyuubi-ctl
Authored-by: sunfangbin <sunfangbin@cmss.chinamobile.com>
Signed-off-by: Kent Yao <yao@apache.org>
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