unit: Add register missing name over tcp
unit: Add register missing name over tcp

Add attempt of registering an invalid device name over tcp transport.
PDU is not including devName field.

CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source