Replace deprecated oslo.messaging.get_transport with get_notification_transport
Replace deprecated oslo.messaging.get_transport with get_notification_transport

Warning: Using function/method 'oslo_messaging.transport.get_transport()'
is deprecated: use get_rpc_transport or get_notification_transport

Change-Id: Ib686e6761983fd7e988f33d5cfc4864e62c6763f

openstack/octavia,openstack/octavia,openstack/octavia