[minigraph] generate device under test minigraph file#207

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maggiemsft merged 4 commits intosonic-net:masterfrom

maggiemsft:masun/minigraph-gen

Jul 20, 2017

Commits on Jul 5, 2017

generate match SONiC minigraph based on testbed name and type defined in testbed.csv
maggiemsft
committed

Commits on Jul 10, 2017

fixes based on feedback
maggiemsft
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Commits on Jul 18, 2017

using port_config to get interface name and alias and fixes based on feedback
maggiemsft
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Commits on Jul 20, 2017

use index to find the port name or alias
maggiemsft
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