phosphor-pid-control: dbus tuning interface

[Jason Ling]

Apologies if this has already been discussed but..
Would the community benefit from the addition of a dbus tuning interface
for phosphor-pid-control?

To get things going:

   - initial thoughts would be to have the details of each thermal/fan PID
   control pushed onto dbus with loop parameters being r/w.
      - I'm not sure about whether the output or input to the loops should
      be published as properties.
   - Have this capability compiled out or runtime disabled by default

Things I worry about:

   - If the phosphor-pid-loop updates the PID output/input/error to dbus on
   every evaluation cycle will it bring adversely affect dbus performance or
   bring a system to its knees? is it better to just implement the querying of
   pid loop updates as a dbus method?
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