micro-service error message amended to match acceptance criteria. test also added (on previous commit)
micro-service error message amended to match acceptance criteria. test also added (on previous commit)


Former-commit-id: a307a146aab69d33c3b6fdfb093764381f304b27
dvla/vehicles-online,dvla/vehicles-presentation-common,dvla/vrm-retention-online,dvla/vehicles-online,dvla/vrm-retention-online,dvla/vrm-retention-online,dvla/vrm-retention-online,dvla/vehicles-presentation-common,dvla/vehicles-online,dvla/vehicles-presentation-common,dvla/vehicles-online