Alarms and Media visibly muted in PriorityOnly dnd

- if alarms and/or media cannot pass dnd and the phone is currently
in priority only dnd, then the alarm and/or media volume stream
will appear muted in the volume dialog and sound settings
(Settings > Sound)
- if all behavior for priority only dnd is not allowed to bypass dnd
(discluding alarms and media), then ringer is muted when priority-only
dnd mode is on. If a user clicks this ringer in the volume dialog, then
dnd ends
- Updated default zen config to version 3 (added alarms and media)
Test: manually toggle alarms + media in Settings > Sound > DND >
Behavior, toggle on/off dnd and then look at volume dialog and
volume bars in Settings > Sound
Test: runtest --path cts/tests/tests/media/src/android/media/cts/AudioManagerTest.java
Fixes: 72052742

Change-Id: Ia9e809ec2be93cb5a9ba6518dce04bf3ce45110b