Bug: 18887435 Change-Id: Ice44c14fc8ee79eab259caf486e123b6af21ceb0
Close the update package before invoking the binary, to allow the installer to unmount /cache if it wants to. Add a function to allow remounting of a mount as read-only. Change-Id: Idfcc96c3da66083295177f729263560be58034e4