Currently, the service-create notification "Service implemented !" sent by the feature nbi-notifications to a Kafka broker is send at the end of the renderer operation, which is not exaclty the real end of the global service creation process, since the service datastore update has not been made yet.

The notification "Service implemented !" should be send by the  nbinotification feature after the service data-store update.

Same issue is encountered for the service-delete notification "Service Deleted !".

 Morevoer, in the scope of the MDONS project, it is requested to only send a single notification giving the final status of the creation/deletion operation (instead of two of three as currently performed).

Acceptance criteria : the code does not introduce regressions.