Add new amqp interface and configure ceilometermiddleware to
send telemetry notifications via RabbitMQ when swift-proxy is
related to the rabbitmq-server charm.
This change also includes some tidyup to include required
components in the swift pipelines (automagically added by swift
prior to this).
Change-Id: Ie3c5c87b31d805cb7e62fa47c322402f47dd0d33
Closes-Bug: 1321281