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1) Select NST request comes from SO to OOF OOF. The request will contain the service profile
2) OOF accepts the request & sends a synchronous response to SO
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5) OOF calls AAI to fetch only the NSTs information.
6) AAI returns all the NSTs NST's metadata in the response. Metadata includes the model-invariant-id, the model-version & the model-name
GET aai/v19/service-design-and-creation/models?role=NST
7) For every NST, OOF will call SDC to download the corresponding CSAR artifact (The URL to download the CSAR will be formed by the metadata info fetched from AAI)
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