Use start and stop methods of patch in scenario

This ensure that the modification on the object are removed at the end of the
scenario.

issue10422
review332891002
(grafted from 2b749711d629c35c1d2025fddb053ddb3bfa5edd)

--HG--
branch : 6.0

tests/scenario_web_shop_vue_storefront.rst

@@ -5,7 +5,7 @@ Web Shop Vue Storefront Scenario
 Imports::
 
     >>> from decimal import Decimal
-    >>> from unittest.mock import MagicMock, ANY
+    >>> from unittest.mock import MagicMock, ANY, patch
 
     >>> from proteus import Model
     >>> from trytond.tests.tools import activate_modules
@@ -21,7 +21,8 @@ Patch elasticsearch::
 
     >>> from trytond.modules.web_shop_vue_storefront import web
     >>> es = MagicMock()
-    >>> web.VSFElasticsearch = MagicMock(return_value=es)
+    >>> _ = patch.object(
+    ...     web, 'VSFElasticsearch', return_value=es).start()
 
 Install web_shop_vue_storefront::