ensure the notification reporting module executes last #1480 (thanks …

…Maurotb)

That way the notified party may collect the HTML & PDF reports, use the
MongoDB data, etc.

cuckoo/reporting/notification.py

@@ -19,6 +19,7 @@ def default(obj):
 
 class Notification(Report):
     """Notifies external service about finished analysis via URL."""
+    order = 3
 
     def run(self, results):
         post = {