a28c18cc00
Oslo.messaging uses the transport_url to represent the rpc and notification messaging driver to use and its full configuration. The rpc_backend configuration option is deprecated for removal and should not gate oslo.messaging driver configuration options. This patch: * deprecate rpc_backend * remove conditional check * update spec tests * add release note Change-Id: I1537c9e0db956d4271c8334a0aa543cd20c57e67