Updated openstack/openstack
Project: openstack/oslo.messaging  875acfc29b0f9eb5880ca280eef8afcca18ad2e8
null
Remove the partial implementation of ack_on_error

The ack_on_error is not used by the abstraction layer, and only the
rabbitmq implements it.

This commit remove this feature, and next commit will add a new way for
this.

Partial implements blueprint notification-subscriber-server

Change-Id: I17eb23f2e3e374630251576438011f186e5b2150