Enable moving applications to an external volume

* Always enable moving applications to an external volume if it is
  available and mounted

Change-Id: Ia683eda30338dfad0d7e78087d42d7e512fa83e4
Don't use CMUpdater as the system updater

Change-Id: Ic1eec7c73a1f34fbc174d7354f3d3cceba6e1ab3