Updated openstack/openstack
Project: openstack-dev/devstack  cab1eb12c667d218a4de76ef5e546bfc05efcd97

cinder: use non-deprecated notification_driver

Cinder has been using oslo.messaging since Icehouse so it should be
using 'messaging' as its notification driver and not the now deprecated
full python path to the oslo-incubator notification driver.

Change-Id: I3edca1ff54e51b464cc1b23935c8530e2e242fee