remove token from notifier middleware

notifier middleware is capturing token and sending it to MQ. this
is not advisable so we should filter it out.

Change-Id: Ia1bfa1bd24989681db1d2f385defc12e69a01f8d
Closes-Bug: #1321080

ceilometer/openstack/common/middleware/notifier.py

@@ -68,7 +68,7 @@ class RequestNotifier(base.Middleware):
 
         """
         return dict((k, v) for k, v in six.iteritems(environ)
-                    if k.isupper())
+                    if k.isupper() and k != 'HTTP_X_AUTH_TOKEN')
 
     @log_and_ignore_error
     def process_request(self, request):