Use DevicePolicyManager.setDeviceOwner on S+.

This allows us to enter the state of running on a secondary user on a
device with a device owner - except that currently
forceUpdateUserSetupComplete doesn't allow calling from secondary users.

Test: atest HarrierTest
Test: atest NeneTest
Bug: 177663307
Change-Id: Ib69f55906ff31c326510c9c15214fbec367a54f1
11 files changed