Remove only the calling user's alarms in cancelAll

When calling cancelAll, the system should not also remove alarms
set by another instance of the app running in another user.

Test: FrameworksMockingServicesTests:AlarmManagerServiceTest

Bug: 182859584
Change-Id: Id554beb6dbb77f5128b7a34c5b0cf9b9ee5dab7d
2 files changed