Moved all DNN test cases into benchmark dir

...nn_benchmarks/pytorch/test_frontend/resnet18_cifar10.test

...n_benchmarks/pytorch/test_frontend/resnet50_imagenet.test

...rks/dnn_benchmarks/pytorch/test_frontend/test_frontend.py

...s/dnn_benchmarks/pytorch/test_frontend/vgg16_cifar10.test

.../dnn_benchmarks/pytorch/test_frontend/vgg16_cifar100.test

.../dnn_benchmarks/pytorch/test_frontend/vgg16_imagenet.test

...n_benchmarks/pytorch/test_profiling/alexnet2_cifar10.test

...nn_benchmarks/pytorch/test_profiling/alexnet_cifar10.test

...ks/dnn_benchmarks/pytorch/test_profiling/lenet_mnist.test

...nchmarks/dnn_benchmarks/pytorch/test_profiling/lit.cfg.py

..._benchmarks/pytorch/test_profiling/mobilenet_cifar10.test

...n_benchmarks/pytorch/test_profiling/resnet18_cifar10.test

...s/dnn_benchmarks/pytorch/test_profiling/test_profiling.py

.../dnn_benchmarks/pytorch/test_tuning/alexnet_imagenet.test

...ks/dnn_benchmarks/pytorch/test_tuning/lenet_mnist_p1.test

.../benchmarks/dnn_benchmarks/pytorch/test_tuning/lit.cfg.py

...dnn_benchmarks/pytorch/test_tuning/mobilenet_cifar10.test

.../dnn_benchmarks/pytorch/test_tuning/resnet18_cifar10.test

...chmarks/dnn_benchmarks/pytorch/test_tuning/test_tuning.py

...rks/dnn_benchmarks/pytorch/test_tuning/vgg16_cifar10.test