[FIX] web: prevent some rpcs in tests

each time a js test is run, it used to start the chat manager, which
does a rpc.  This simply prevent the chat manager to start.

addons/web/static/test/testing.js

@@ -3,6 +3,7 @@ odoo.testing = {};
 
 odoo.testing.start_services = function () {
     var factories = odoo.__DEBUG__.factories;
+    delete factories['mail.chat_manager'];
     var jobs = _.map(factories, function (factory, name) {
         return {
             name: name,