Allow device and profile owner to modify accounts

The user restriction DISALLOW_MODIFY_ACCOUNTS and the policy
DPM.setAccountManagementDisabled can now be circumvented by a device
or profile owner. This allows the device or profile owner to add
accounts without briefly having to remove the policy.

Bug: 22030831
Change-Id: I2b59c4b3ad354287d7a00f21b2afef072d12517d
3 files changed