SO NFVO needs to enhance the Delete NS backend operations and workflows which do the following sequence: - validate if it works with 3.3.1

• Upgrade the NS LCM and workflows for 3.3.1 and test the existing functions.
• Test the following scenarios are still working:
  • Supports SOL005-compliant DeleteNS operation with nsInstanceId
  • Creates BPMN workflows and business logic for the following Delete NS operations
    • Supports input parameter handling
      • Initialize Parameters: get ns_inst_id
    • Deletes ns instance in AAI
      • Gets ns_instances from NFVO_NSINST database table
      • if there are ns_instances, 
        • Queries AAI for global_customer_id, service_type, ns_inst_id
          • set resource_version from ns_info "resource-version"
        • Invokes delete_ns_aai with global_customer_id, service_type, ns_inst_id, resource_version
          • Formulates the resource url with parameters
          • Invoke AAI Rest API: call_aaI (resource, "DELETE")
      • note: if there are discrepancies between VNF and NS status in AAI (e.g., VNF was not deleted yet), it is an error condition
    • Deletes ns_inst_id row from the NFVO_NSINST database table
      • note: if multiple records for the givin ns_inst_id are found, it is an error condition
    • Deletes ns_inst_id row from the t_lcm_inputparam_mapping database table
    • Deletes ns_inst_id row from the t_lcm_defPackage_mapping database table
    • Deletes ns_inst_id row from the t_lcm_servicebaseinfo database table
    • Returns 204 No Content
    • Send NsIdentifierDeletionNotification
      • Note: this notification will be handled by a separate notification and subscription user story.