Container: delete overlay tempdir upon cleanup

lxc_net/container.py

@@ -210,6 +210,10 @@ class Container(util.LibvirtObject):
                     raise exn
                 # Else, the machine was already stopped: everything is fine
             self.lxc_container = None
+        if self.overlay_root:
+            self.overlay_root.cleanup_mount()
+            self.overlay_root.overlay_temp_dir.cleanup()
+            self.overlay_root = None
 
     def __enter__(self):
         self.create()