[thermal control] Backport changes from master to 201911 branch#90

Merged

jleveque merged 4 commits intosonic-net:201911from

Junchao-Mellanox:thermal-201911-1

Jun 3, 2020

Commits on May 28, 2020

Support thermal policy management including policy file loading, information collecting, condition matching and action executing policy (#73)
Junchao-Mellanox
committed
[Mellanox] Add validation for thermal policy (#78)
Junchao-Mellanox
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Commits on Jun 1, 2020

Fix build failure
Junchao-Mellanox
committed

Commits on Jun 3, 2020

Add EOL to .gitignore file
Junchao-Mellanox
committed