Fix Replace a Node API behaviour handling List items

Fix Replace a Node API behaviour handling List items

Jira - [CPS-2708] Enhance Replace A Node with List Items
Documentation - https://lf-onap.atlassian.net/wiki/x/gIDMAQ

- Previously, Replace a node endpoint accepted list items and returned a
  200 OK response, but the data was not actually replaced when cross
  checked.
- This patch fixes the issue of phantom replace operations and ensures
  that the API correctly handles list items.

Issue-ID:CPS-2708
Change-Id: Ibc9bbb88ccbb07302355321c6d5c2eade0e7e5fa
Signed-off-by: Arpit Singh <AS00745003@techmahindra.com>