his commit adds support for the oslo.messaging amqp rpc_backend which enables
the AMQP 1.0 driver. A proposed feature for the Newton oslo.messaging release is
an update to the AMQP 1.0 driver to support a stateless messaging interconnect
for RPC traffic[1].
This patch:
* use oslo::messaging::amqp resource
* add new parameters for the oslo_messaging_amqp driver
* update spec tests for amqp as alternate rpc_backend
* add feature release note
[1] https://blueprints.launchpad.net/oslo.messaging/+spec/amqp-dispatch-router
Change-Id: I314f0f6bbba07d32f720b650b12c7bd30d07d295