Improvements on 'dumpsys activity' for users:

- Added option to dump UserController state.
- Moved UserController dump out of processes dump
- Added missing info

Test: adb shell dumpsys activity users
Bug: 132111956
Bug: 145027829
Fixes: 144920143

Change-Id: I318700e29f5b896260a97a6f6248ba262f27e5a7