sensors: Several fixes

This update fixes the following issues with sensors:
- bnc#810344:
+ pwmconfig: Raise the detection threshold to 3/4
+ pwmconfig: Drop a stray comment.
+ pwmconfig: Properly deal with multiple fan control
+ fancontrol: Fix handling of absolute paths in config
+ Add fancontrol.service

Fixed bugs
bnc#810344
fancontrol not starting
Selected Binaries
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