Inconsistency With JSON Response(List Items) Using ReplaceANode API

Inconsistency With JSON Response(List Items) Using ReplaceANode API

Jira - https://lf-onap.atlassian.net/browse/CPS-2800
Documentation - https://lf-onap.atlassian.net/wiki/x/gIDMAQ

- Updated DataRestController.java to return 201 for new nodes
- CpsDataService.java Changed method signature to return boolean
- Added logic to detect new nodes in CpsDataServiceImpl.java
- Implements the new logic for detecting and inserting new nodes in CpsDataPersistenceServiceImpl.java
- Added testcases for above changes

Issue-ID: CPS-2800
Change-Id: Ibc9bbb88ccbb07302355321c6d5c2eade0e7e5fb
Signed-off-by: Rudrangi Anupriya <ra00745022@techmahindra.com>
Signed-off-by: GM001016278 <gourav.malviya@techmahindra.com>