If the transport_url of nova's oslo messaging notification and the default transport_url value are different, timeout occurs when oslo_messaging.RPCClient.call is executed because of the part written in oslo_messaging.get_notification_transport.
This change moves the health probe to use get_rpc_transport instead.
story: 2010766
task: 48074
Change-Id: Ia6a2b9ce500e8806f76882b28f4d9cca440b6e1a
b6cbbf38a9