For HDFS tvf like:
```
select count(*) from hdfs(
"uri" = "hdfs://HDFS8000871/path/to/1.parquet",
"fs.defaultFS" = "hdfs://HDFS8000871/",
"format" = "parquet"
);
```
Before, if the `fs.defaultFS` is end with `/`, the query will fail with error like:
```
reason: RemoteException: File does not exist: /user/doris/path/to/1.parquet
```
You can see that is a wrong path with wrong prefix `/user/doris`
User need to set `fs.defaultFS` to `hdfs://HDFS8000871` to avoid this error.
This PR fix this issue
586df24b9d