[dts] [PATCH V2] framework/pktgen.py: code optimization for trex support

[Liu, Yong]

Thanks fei, applied into next branch.

On 01/09/2018 08:07 PM, wang fei wrote:
> patch for next branch: remove hardcode and enhance TREX function by adding
> DUT and TREX port mapping
>
> Signed-off-by: wang fei<feix.y.wang at intel.com>