Add serializer param to RPC service
Add serializer param to RPC service

Allow a serializer to be passed to RPC service class
when it is instantiated.

Change-Id: I4162d8e94d023b9b724ea35b02823ddd6317032b

citrix-openstack-build/ironic-lib,openstack/ironic-lib,faizan-barmawer/elytics,faizan-barmawer/ironic-lib,NaohiroTamura/ironic-lib