Private DNS: Test DPM is not restricted by user restriction

Add a test to make sure that the Private DNS mode can be changed via the
DevicePolicyManager despite a user restriction being present.

Bug: 120416121
Test: atest com.android.cts.devicepolicy.DeviceOwnerTest#testPrivateDnsPolicy
Change-Id: I77647b70240dc3faa8b5bb9fb7159e96205931d4
1 file changed