Updated openstack/openstack
Project: openstack/ceilometer  aab1800d0d08189a3f2bbe008edccd4298ad2a86
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Use NotificationPlugin as an oslo.msg endpoint

This refactor the NotificationPlugin code to have
NotificationPlugin acting as a oslo.messaging endpoint

Change-Id: Iecdce3513a22a1c1d5037ed2969c6333e893791d