Actually test callbacks in GetUpdatesTest.

The tests in GetUpdatesTest had some callback logic that has
been dead code for at least three months.  We now fully exercise
the callback codepath and make sure that the callbacks do happen.

(imported from commit f5d8fbab28ecc34dc81d3d0c29058b66c10f378f)

zephyr/tornado_callbacks.py

@@ -120,7 +120,7 @@ def initialize_user_messages():
         stream = streams[m.recipient.type_id]
         add_stream_message(stream.realm.id, stream.name, m.id)
 
-    if not settings.DEPLOYED:
+    if not settings.DEPLOYED and not settings.TEST_SUITE:
         # Filling the memcached cache is a little slow, so do it in a child process.
         # For DEPLOYED cases, we run this from restart_server.
         subprocess.Popen(["python", os.path.join(os.path.dirname(__file__), "..", "manage.py"),
@@ -352,6 +352,8 @@ def send_notification_http(data):
         requests.post(settings.TORNADO_SERVER + '/notify_tornado', data=dict(
                 data   = ujson.dumps(data),
                 secret = settings.SHARED_SECRET))
+    else:
+        process_notification(data)
 
 def send_notification(data):
     return queue_json_publish("notify_tornado", data, send_notification_http)