Revert "[APPEND][FSTORE-1536] Refetch s3 credential (#355)"

This reverts commit c1df5dd.

Author: manu-sj

python/hsfs/storage_connector.py

@@ -373,7 +373,6 @@ def prepare_spark(self, path: Optional[str] = None) -> Optional[str]:
 
     def connector_options(self) -> Dict[str, Any]:
         """Return options to be passed to an external S3 connector library"""
-        self.refetch()
         return {
             "access_key": self.access_key,
             "secret_key": self.secret_key,