Use exact date and time instead of "tomorrow" in notification

This helps avoid confusion if the user only sees the notification the
next day.

Bug: 155740352
Test: manual with TestDPC
Test: atest com.android.server.devicepolicy.DevicePolicyManagerTest
Change-Id: I6c95a6db2e8967eeffa373f96170cd610f13856a
4 files changed