Commits on Feb 9, 2018

1. [device/dell] Get Server ports from vlan config …

   This commit adds new support for dynamic buffer configuration. The cable_length macro is
   updated to return the cable length for server ports. Since the server ports are part of
   VLAN MEMBERS, the macro loops through the VLAN MEMBER ports and returns the cable length
   accordingly. If the port is not part of the SERVER port then it defaults to default cable
   length. The new code in the macro will be executed only if the switch is ToRRouter
   which is connected to the server on one side.
   
   Tested the code by loading minigraph configuration on the switch which had configuration
   for leaf-router as DEVICE NEIGHHOR and server ports in VLAN and ports which are not part of
    either server or leaf router. The dynamically generated buffer.json and config_db.json file
   had the cable_legnth updated accordingly for server ports with "5m" and leafrouter with "40m"
   and unconnected port to default "300m". The redis database also reflects the buffer profile's
    for 5m, 40m and 300m.
   
   Signed-off-by: Harish Venkatraman <Harish_Venkatraman@dell.com>

   Harish Venkatraman authored and Harish Venkatraman committed Feb 9, 2018
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