Actually save changes from post-stop sync

After stopping containers, we run updateContainerStatus to sync
our state with runc (pick up exit code, for example). Then we
proceed to not save this to the database, requiring us to grab it
again on the next sync. This should remove the need to read the
exit file more than once.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

libpod/container_internal.go

@@ -679,7 +679,7 @@ func (c *Container) stop(timeout uint) error {
 	}
 
 	// Container should clean itself up
-	return nil
+	return c.save()
 }
 
 // Internal, non-locking function to pause a container