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

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

Change-Id: Id44fcade5466857e239fdb1cb0827c925badcb48

openstack/solum,stackforge/solum,stackforge/solum,openstack/solum