Commits on Aug 15, 2020

1. Support single ingress pool for MSFT SKUs and optimize headroom calcu… …

   …lation
   
   This is to backport the sonic-net#4886 to 201911
   
   Calculate pool size in t1 as 24 * downlink port + 8 * uplink port
   
   - Take both port and peer MTU into account when calculating headroom
   - Worst case factor is decreased to 50%
   - Mellanox-SN2700-C28D8 t0, assume 48 * 50G/5m + 8 * 100G/40m ports
   - Mellanox-SN2700 (C32)
     - t0: 16 * 100G/5m + 16 * 100G/40m
     - t1: 16 * 100G/40m + 16 * 100G/300m
   
   Signed-off-by: Stephen Sun <stephens@nvidia.com>

   

   stephenxs committed Aug 15, 2020
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