arcopole: reset cookies before association

Closes #5961

mandaye_cud/filters/cud.py

@@ -9,6 +9,11 @@ from mandaye.response import _302
 
 class ArcopoleFilter:
 
+    @staticmethod
+    def associate_req(env, values, request):
+        request.cookies = None
+        return request
+
     @staticmethod
     def associate(env, values, request, response):
         qs = parse_qs(env['QUERY_STRING'])

mandaye_cud/mappers/arcopole.py

@@ -93,6 +93,9 @@ mapping = [
             'path': r'/studio/mandayeassociate$',
             'method': 'GET',
             'target': '/studio/accueil',
+            'on_request': [
+                {'filter': ArcopoleFilter.associate_req,}
+                ],
             'on_response': [{
                 'filter': ArcopoleFilter.associate,
                 'values': {