**- Why I did it**
There is a preference to use thermalctld instead of fancontrol for 201911 release branch. The Arista platform submodule updates and thermal policies in the platforms will allow Arista devices to use thermalctld instead of fancontrol.
**- How I did it**
I cherry-picked the necessary commits from master branch for sonic-platform-modules-arista into 201911 branch. I've also added the file to skip fancontrol and added the thermal policies json.
**- How to verify it**
On Gardena, Upperlake, Clearlake, and Lodoga thermalctld is up and running with no errors. Fans show ~29%.
Co-authored-by: Zhi Yuan Carl Zhao <zyzhao@arista.com>
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