Keep trace of service on configured elements

Circuit-id on interfaces and ports can be used to link resources to provisioned services, and so help handling alarm correlation. The circuit-id shall be configured by the controller, when the interfaces and related ports are configured. This could also be configured after the service has been confirmed as operational (after the BER test), but we may want to limit the configuration operations. Propose to configure circuit-id with the service-name since this is a string, to have a direct mapping.