This allows to delete the update only if the installation succeeded
and to notify the user in case the installation failed.
Since we now need the file in case of failure, create a copy for
uncrypt even if the user chose to delete installed updates.
Change-Id: I80b0f499663bbf50bcbca5f643c01ffdb4cd3957
UpdateEngine doesn't send an initial notification to bound client
if the last status is not known, so clear the preference when we
detect that the device has been rebooted.
Change-Id: Ib15dff5fa8ac9ec07a68018a83683cc561fd3e85