[Mellanox]support led for fan/psu and fan direction#17

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stephenxs wants to merge 6 commits intomasterfrom

Commits on Nov 20, 2019

[sonic_platform]support led for fan/psu and fan direction on SPC2 devices
Stephen Sun
committed
[sonic_platform]address comments
Stephen Sun
committed

Commits on Nov 21, 2019

[sonic_platform]address comments
Stephen Sun
committed
[sonic_platform]fix typo
Stephen Sun
committed

Commits on Nov 24, 2019

[sonic_platform]fix typo: fan's direction isn't supported on spectrum 1 for now.
Stephen Sun
committed

Commits on Nov 25, 2019

[sonic_platform]rename the spectrum chip id
Stephen Sun
committed