[Mellanox]Update SDK(4.3.2104), SAI-Implementation(1.15) and firmware 2162.#3536

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stephenxs wants to merge 1 commit intosonic-net:masterfrom

stephenxs:sai-1.15

Commits on Sep 29, 2019

[mellanox]Integrate sai-1.15, sdk 4.3.2104 and firmware 2162 to sonic.
Stephen
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