Updated openstack/openstack
Project: openstack/oslo.messaging  555eb7980bdfa4b1df17f1cab6532e51b0ecc955

Fix the notifier example

The notifier should be instantiated using messaging.Notifier, not
notifier.Notifier.

Change-Id: Id1930df6b758b292a7591e2e4cba2ef5a313a3cb