Fix: Set does not update the model within the database

controller/api/initialise_test.go

controller/interfaces/change/change.go

controller/interfaces/southbound/sbi.go

controller/mocks/Change.go

controller/mocks/NetworkDomain.go

controller/northbound/server/pnd.go

controller/nucleus/change.go

controller/nucleus/gnmi_transport_test.go

controller/nucleus/initialise_test.go

controller/nucleus/networkElement.go

controller/nucleus/networkElementService_test.go

controller/nucleus/networkElementWatcher.go

controller/nucleus/principalNetworkDomain.go

controller/nucleus/principalNetworkDomain_test.go

controller/nucleus/southbound.go

controller/nucleus/southbound_test.go

controller/test/plugin/csbiAdditions.go