Supports the Delete NS backend operations and workflows which do the following sequence:

<Delete NS: note: the following workflow is a template, and it can be enhanced as needed.>

• 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
    • if multiple records are found for the given ns_inst_id, 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
  • Note: Send NsIdentifierDeletionNotification
    • Note: this notification will be handled by a separate notification and subscription user story.
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