This is the start of turning this into a formal public API. Change-Id: I5786d2c320f1de41a06ed5d0f65adb68967287a0
Moved a bunch of methods from PackageManager to UserManager. Fix launching of activities from recents to correct user. Guest creation APIs Change-Id: I0733405e6eb2829675665e225c759d6baa2b708f