Fix autogroupsummary bug

Summary cannot be updated with key after notification is removed from NotificationsByKey.
So OngoingFlag of Autogrounpsummary remains.
Modify the GroupHelper interface to deliver summary updateable information.

Test: Make autogroupsummary.
Test: update one of notification with ongoing flag.
Test: cancel the notification and check flag of autogroupsummary.
Change-Id: I0d14daaa69a94c1a3fe81b12d16b44e3a78281fe