[Mellanox] Optimize SFP related platform API implementation#4

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keboliu wants to merge 4 commits intomasterfrom optimize-sfp-api

Commits on Sep 24, 2020

Optimize Mellanox SFP related platform API implementation, all SFP object share one SDK handle instead each object have their own
keboliu
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Commits on Sep 25, 2020

fix review comments
keboliu
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Commits on Sep 28, 2020