[platform] Implement platform phase 1 cases#915

Merged

liat-grozovik merged 4 commits intosonic-net:masterfrom

wangxin:platform-pytest-pr

Jun 23, 2019

Commits on May 16, 2019

[platform] Implement platform phase 1 cases
Xin Wang
committed

Commits on May 25, 2019

[platform] Add mellanox_psu_controller.py
Xin Wang
committed

Commits on Jun 3, 2019

[platform] Improve scripts according to review comments
Xin Wang
committed

Commits on Jun 22, 2019

[platform] Fix the issue of comparing syseeprom output
Xin Wang
committed