Updated openstack/openstack
Project: openstack/oslo.messaging  7473d18ebe1506836c65ea1334d180d7ff48a744
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Abstract the acknowledge layer of a message

The patch add ta abstraction layer to acknowledge a message.

Partial implements blueprint notification-subscriber-server

Change-Id: I6e37780cc28737cfd56b6719ec8d9cebbc9bb278