[Bug] 1.6.0 DorisOptions fenodes doesn't support domain name

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.

### Version

1.6.0

### What's Wrong?

DorisOptions fenodes doesn't support domain name
'fenodes' = 'xxxx' , xxx must be like IP:HOST, but i use a domain to lead to FE

### What You Expected?

'fenodes' = 'xxxx'
fenodes options support domain like versions 1.4.0

### How to Reproduce?

_No response_

### Anything Else?

_No response_

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Start at the DorisOptions entry point and trace how the fenodes value is parsed or validated. Compare that behavior with version 1.4.0, where domain names reportedly worked, and verify the change with a domain-based fenodes value.

Written by the indexing model from the issue text.