Part 1: Grouping of Data Nodes in Delta Report

Part 1: Grouping of Data Nodes in Delta Report

Add-on feature in delta report to generate condensed delta report by
grouping data nodes based on parent child relationship.

The patch adds grouping feature for "create" operation in delta report.

- Added boolean flag "groupingEnabled" to enable or disable grouping of
  data nodes in delta report. Default value is false.
- Added a method getCondensedAddedDeltaReports to generate condensed
  delta reports for create operation.
- Part 2 of this patch will have code for updated and removed delta
  report entries when grouping is enabled.
- A separate patch to add integration tests will be done after feature
  is implemented. This is done to keep patch sizes small

Issue-ID: CPS-2547
Change-Id: Ibb4d35b03098be7b57cb59852a87f6b4e0c7b706
Signed-off-by: Arpit Singh <AS00745003@techmahindra.com>