Verfiy global apps with device owner

Applications installed for a specific user must be verfied as that user. However,
apps that are installed globally [i.e. UserHandle.ALL] should not be verified by
every user on the device. Instead, they should be verified by the device owner.

Bug: 21901423
Change-Id: I5fd3f690d08e7e911a3c86f09bbfcd4eb635b418