PLT-6492 Use new cookie to determine if user is logged in (#6317)

* Use new cookie to determine if user is logged in

* Add temporary code for 3.9 to prevent forced re-login

webapp/store/index.js

@@ -77,6 +77,9 @@ export default function configureStore(initialState) {
 
                     persistor.purge();
 
+                    document.cookie = 'MMUSERID=;expires=Thu, 01 Jan 1970 00:00:01 GMT;';
+                    window.location.href = '/';
+
                     store.dispatch(batchActions([
                         {
                             type: General.OFFLINE_STORE_RESET,
@@ -84,9 +87,6 @@ export default function configureStore(initialState) {
                         }
                     ]));
 
-                    localStorage.removeItem('currentUserId');
-                    window.location.href = '/';
-
                     setTimeout(() => {
                         purging = false;
                     }, 500);