Add support for delete operation

- Added new column operation in DB
- Updated existing rows to have 'UPDATE' value for operation field
- Added ability to process both V1 and V2 event schema
- Changed code and testcase to support operation field

Issue-ID: CPS-790
Signed-off-by: Renu Kumari <renu.kumari@bell.ca>
Change-Id: Ife24daa4b442e1499094b162727cc8704c25011e
15 files changed