Adding yolo model and its assets (sans the checkpoint)

hpvm/test/epoch_dnn/assets/yolo/atr_dataset.tar.gz

hpvm/test/epoch_dnn/assets/yolo/scales.txt

hpvm/test/epoch_dnn/torch_dnn/yolo/__init__.py

hpvm/test/epoch_dnn/torch_dnn/yolo/dataset.py

hpvm/test/epoch_dnn/torch_dnn/yolo/loss.py

hpvm/test/epoch_dnn/torch_dnn/yolo/model.py