[pull] master from Azure:master#1224

Merged

pull[bot] merged 3 commits intopphuchar:masterfrom

sonic-net:master

Dec 16, 2020

Commits on Dec 16, 2020

Chassisd to monitor cards in a modular chassis (#5523)
mprabhu-nokia
authored
[Mellanox] Add high threshold and high critical threshold support for gearbox (#6206)
Junchao-Mellanox
authored
In modular chassis, add CHASSIS_STATE_DB on control card (#5624)
mprabhu-nokia
authored