SOL003 VNF Lifecycle Operation Granting - Implementation of deltas between v3.3.1 and v2.7.1

This merge request refers to the implementation of deltas between v3.3.1 and v2.7.1 of SOL003 VNF Lifecycle Operation Granting Interface.

@lynchpi @aelken @matsuurat @carignani @sayama @kraja @zulfiqar @zafar

Deadline for review: Friday 12th March 2021 @6pm CET

Review period elapsed: approved !

SOL003/VNFLifecycleOperationGranting-API/jsons/grantRejectedRequest.json

@@ -5,6 +5,7 @@
   "flavourId": "{flavourId}",
   "operation": "INSTANTIATE",
   "isAutomaticInvocation": true,
+  "instantiationLevelId": "",
   "_links": {{
     "vnfLcmOpOcc": {{
       "href": "string"