SOL003 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 SOL003 VNF Indicator Interface.

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

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

Review period elapsed: approved !

added MR ready to review label

changed the description

added MR ready to be merged label and removed MR ready to review label

added 28 commits

• 5bb9a747...29614667 - 24 commits from branch 3.3.1-dev
• 9081fa22 - updated versions
• 52bf1bae - added new test for API Consumer Notification
• 913ed3d1 - updated schema
• 4f252df4 - updated references

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merged

mentioned in commit e11ef6aa