* Prompt for password once when the sql instance password doesn't work for hdfs. If the user provides the correct password, connect and continue, else show Unauthorized node.
* Removed the hardcoded bad password
* Added check for empty folder scenarios
* Added ErrorStatusCode as property of TreeNode. Checking for the error code instead of the error string to avoid localization issues
* type fixed
* implemented hasExpansionError
* Added Unified connection support
* Use generic way to do expandNode.
Cleanup the ported code and removed unreference code. Added as needed later.
Resolved PR comments.
* Minor fixes and removed timer for all expanders for now. If any providers can't response, the tree node will spin and wait. We may improve later.
* Change handSessionClose to not thenable.
Added a node to OE to show error message instead of reject. So we could show partial expanded result if get any.
Resolve PR comments
* Minor fixes of PR comments
