We need to have a "category" field in the model schema for OOF to fetch only the NSTs (metadata) from AAI during NST selection.

When AAI receives the SDC notification and downloads the CSAR artifact, the category is available as metadata in the artifact. Babel parses the template and has the category available as part of the metadata. So, this requires the following enhancements only:

• Schema change - to include the role (category)
• Babel - to extract category info from csar artifact, update the model to include category
• Model loader - changes to receive the new model with category info from Babel and store it in the database.