Fixed Admin Auth Token in Notification

   before notifications are sent - admin auth token is
   set to None to ensure it is not logged

Fixes: Bug 1218028
Change-Id: Ib53244f14d8e2e8c77e0bb67e2156e2eb0165866
(cherry picked from commit 52d892fe546535f88915b2a8582d482af7bae4e1)