No-gui mode needs a way to access private data source
When kepler normally executes a workflow which has actors to access the private data, kepler will prompt a login dialog box. Through the login process, the workflow can access the private data successfully.
However, if the workflow is execute in no-gui mode, the login dialog box wouldn't be shown up. The workflow will fail to access the data and cause the workflow running fail. We need a way to fix the issue.