Rename json object on cloud_auth_device
Rename json object on cloud_auth_device

This patch changes json_object name on cloud_auth_device to a more
suitable one. This json_object represents an auth message.

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