Don't save secure information in downloaded workflows - prompt workflow uploader for security info

[Chris-Schnaufer]

Task to do
Remove current saving of security information and have workflow uploader provide their security information to access remote files (such as on IRODS)

Reason
Even with security in place, there's a risk that someone's security information (eg: password) could be made available as plain text. By removing it entirely from a saved workflow this risk is mitigated. Removing it from the workflow means that the uploader of a workflow needs to provide security information to allow access to remote stores.

Result
No security information is stored in a workflow. The uploader is prompted to provide needed security information

Notes
The software will need to detect when security information is needed and prompt the user to enter it