Add support for delete data-node event

- Changed process event input to address delete
- Send null data in the event if the operation is DELETE

Issue-ID: CPS-791
Signed-off-by: Renu Kumari <renu.kumari@bell.ca>
Change-Id: If851f7132e94bcbcaf4324d07a2a00c90d1882b7
6 files changed