[Mellanox] Support new platform api sfp part#3101

Merged

jleveque merged 3 commits intosonic-net:masterfrom stephenxs:npaip-sfp

Jul 2, 2019

+423-29

Commits on Jun 30, 2019

Support new-platform-api sfp part, including the following APIs
Stephen Sun
committed

Commits on Jul 2, 2019

implement tx_disable and power_override related interfaces.
Stephen Sun
committed
adjust code to address the comments
Stephen Sun
committed