SO NFVO NBI API Handler needs to enhance its Create NS to ETSI 3.3.1 from ETSI 2.7.1

• Leveraging ETSI 3.3.1 swagger upgrade, upgrade the Create NS NBI code to support 3.3.1
• Follow and confirm 3.3.1 changes on the message sequencing, request, response, pre- and post-conditions.
• Preconditions: 
  • SOL007 NS packages are stored in ETSI Catalog Manager.
  • if SOL 005 Adapter is not ready, 
    • the Cli-based (Postman-based) SO NFVO Client is ready to send the SOL005-compliant Create NS request
  • if the SOL 005 Adapter / Simulator is ready,
    • SOL 005 Adapter / Simulator subscribed to SO NFVO for LCCN notifications
  • The SO-NFVO (so-etsi-nfvo) pod is ready
• Test the following scenarios: 
  • SO NFVO NBI API Handler needs to support the SOL005-compliant Create NS API 
    • Supports Create NS request API: POST /api/nslcm/v1/ns_instances (CreateNsRequest)
    • Supports Create NS responses with NsInstance with 201 (for success) or an error
      • Returns a dummy 201 until the backend business logic is ready 
      • Only mandatory attributes of NsInstance will be set.
      • Support successful or error conditions
    • Sends NsIdentifierCreationNotification to the NFVO subscriber(s) (e.g., ONAP SO SOL005 Adapter)
      • Note: this will be handled by the separate user story: Sends NsIdentifierCreationNotification to the NFVO subscriber(s) (e.g., ONAP SO SOL005 Adapter)

• Post conditions: the NS Instance is set as NOT_INSTANTIATED state

Note: secure communication is handled by a separate user story, SO-3165.