Checkmk Werk 12633: entity_sensors_temp: use device units for temperature

ID: 12633 Title: entity_sensors_temp: use device units for temperature Component: Checks & agents Level: 1 Class: New feature Version: 2.1.0i1 The entity_sensors_temp check assumed the unit of all temperature sensor readings to be Celsius. With this change, the check reads the temperature unit directly from the device.