Registration Response for Create cmhandles operations

Registration Response for Create cmhandles operations

- Changed implementation to register each cm-handle at a time
  instead of registering all at once
- Removed YangCMHandleList class and using String format to
  generated expected JSON
- Response of all three operation types is returned in the
  updateDmiRegistrationAndSyncModule method
- Changed parseAndRemoveCmHandlesInDmiRegistration to protected
  to keep in sync with create flow
- Refactored existing create CMHandle test cases

Issue-ID: CPS-896
Signed-off-by: Renu Kumari <renu.kumari@bell.ca>
Change-Id: I5b0c01b3b8e31ca7c257b1e04069e35268be1132