[MIG] web_notify: Migration to 11.0

- Use the 'session' class of the JS Framework (session no lounger bound
to web client)
- Test change: compare emitted & received messages based on content, not
order. Using string comparison raises false positives.

web_notify/models/res_users.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Copyright 2016 ACSONE SA/NV
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).