* Fetch and store upsBasicBatteryLastReplaceDate
For APC USV, sensor class is 'runtime'
* Change type string for battery's life time
* Change limits to meaningful values, remove debug output
Limits are 4 (warn) and 5 (critical) years, using our own experience.
* Add time calculation for battery life time during polling
This means that the received date is subtracted from current
time, the difference is stored as minutes, just like with discovery.
* Improve sensor description/label (again)
* Correct label for battery's life time to “operating time”
* Add test data for APC UPS to test new used OID
OID for the last battery exchange date, which is used
for calculation the operation time.
* Changes for styleCI
* Fix more files for styleCI
* Remove a duplicated empty line (styleCI)
* Update test data
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