fix: empty identification cookie on webapp.reset()

--HG--
branch : 3.32

cubicweb/pyramid/test/__init__.py

@@ -14,6 +14,10 @@ class TestApp(webtest.TestApp):
         self.admin_password = admin_password
         self._ident_cookie = None
 
+    def reset(self):
+        super().reset()
+        self._ident_cookie = None
+
     def post(
         self,
         route,