SOL002 VNF Indicator - 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 SOL002 VNF Indicator Interface.

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

Deadline for review: Wednesday 3rd March 2021 @6pm CET

Review period elapsed: approved