Updated openstack/openstack
Project: openstack/heat  5b0fd8836b96c76ca03908f33952a8ccbad5ffb0

Add backward compatibility for notification_driver

Declare additional entry points for notification_driver option to avoid
breaking existing deployments that may use deprecated values.

Change-Id: I4f6abc33d01bb434d8ea9895aea2bfe6324049eb
Closes-Bug: #1355250