Werk #12633: entity_sensors_temp: use device units for temperature

Component	Checks & agents
Title	entity_sensors_temp: use device units for temperature
Date	Mar 30, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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.

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