Add function for generating error strings for different http status codes
Add function for generating error strings for different http status codes

projectcs13/sensor-cloud,EricssonResearch/iot-framework-engine,projectcs13/sensor-cloud,EricssonResearch/iot-framework-engine,projectcs13/sensor-cloud,EricssonResearch/iot-framework-engine,EricssonResearch/iot-framework-engine