wspoon: Add service to help start MAX31785 hwmon

This service will be started in the udev rule for the MAX31785
hotplug add event.  It will wait for the phosphor-cooling-type
service to be done, and then run the script to start the
phosphor-hwmon instance for the MAX31785 fan controller after it
chooses the correct config file to use.

Tested: Test that this service correctly runs the script and that
        phosphor-hwmon does get started.

Change-Id: I4495f7073d63004d4dd8333df8964d69beaae4ea
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
2 files changed