Store device models

controller/api/initialise_test.go

controller/interfaces/device/device.go

controller/northbound/server/pnd.go

controller/northbound/server/pnd_test.go

controller/nucleus/databaseDeviceStore.go

controller/nucleus/databasePndStore.go

controller/nucleus/device.go

controller/nucleus/deviceStore.go

controller/nucleus/device_test.go

controller/nucleus/initialise_test.go

controller/nucleus/principalNetworkDomain.go

controller/nucleus/principalNetworkDomain_test.go

controller/nucleus/southbound.go

csbi/templates.go