Change darknet.py to Python 3 compatibility

Philip Kahn

2018-05-04 eaecb49a5f475440b4e6f05a6e13082be95524eb

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#rm test_dnn_out.avi
 
./darknet detector demo ./cfg/coco.data ./cfg/yolov3.cfg ./yolov3.weightss rtsp://admin:admin12345@192.168.0.228:554 -i 0 -thresh 0.25