Werk #15969: cisco_temperature: Correct warning threshold for environment temperature

Currently only the threshold specified by OID 1.3.6.1.4.1.9.9.13.1.3.1.4 (ciscoEnvMonTemperatureThreshold) is considered when checking the temperature of a Cisco switch. As only one threshold is given here, it is used as both WARN and CRIT threshold, causing confusion when the device itself reports a warning state based on a warning threshold not given via this OID. Now the upper thresholds specified in OID 1.3.6.1.4.1.9.9.91.1.2.1.1 (entSensorThresholdTable) will be used as WARN and CRIT thresholds if an entry for the relevant switch can be found. For this, the threshold relation and severity will be used to determine if the threshold can be applied in Checkmk, otherwise the threshold will be ignored. If no thresholds from the entSensorThresholdTable apply, the ciscoEnvMonTemperatureThreshold is used as a fallback.

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