[202012][Accton] Implement as5835-54t api2.0#8294

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seanwu-ec wants to merge 11 commits intosonic-net:202012from

seanwu-ec:implement_as5835-54t_api2

Commits on Jul 29, 2021

Commits on Aug 2, 2021

[as5835-54t] Fix errors in sfputil.py
seanwu-ec
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Commits on Oct 13, 2021

Fix AS5835-54T xcvrd busy issue
seanwu-ec
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Commits on Dec 10, 2021

[AS5835-54T] add thermal thresholds and cpu temp
seanwu-ec
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Commits on Jan 24, 2022

Revert "[AS5835-54T] add thermal thresholds"
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