[pull] master from Azure:master#871

Merged

pull[bot] merged 3 commits intomudsut4ke:masterfrom

sonic-net:master

Jul 13, 2020

Commits on Jul 13, 2020

[Mellanox] Add system health configuration file for Mellanox platforms (#4834)
Junchao-Mellanox
authored
[Mellanox] Add support for set/get system led status (#4829)
Junchao-Mellanox
authored
Add pcie-check service to check PCIe devices at boot (#4771)
sujinmkang
authored