Moved all DNN test cases into benchmark dir

...hpvm-c/benchmarks/mobilenet_cifar10/mobilenet_cifar10.cpp

.../benchmarks/mobilenet_cifar10/mobilenet_cifar10_cudnn.cpp

...vm-c/benchmarks/resnet18_cifar10/data/quant_ranges_rt.txt

...s/hpvm-c/benchmarks/resnet18_cifar10/data/tuner_confs.txt

...s/hpvm-c/benchmarks/resnet18_cifar10/resnet18_cifar10.cpp

...-c/benchmarks/resnet18_cifar10/resnet18_cifar10_cudnn.cpp

...m-c/benchmarks/resnet50_imagenet/data/quant_ranges_rt.txt

.../hpvm-c/benchmarks/resnet50_imagenet/data/tuner_confs.txt

...hpvm-c/benchmarks/resnet50_imagenet/resnet50_imagenet.cpp

.../benchmarks/resnet50_imagenet/resnet50_imagenet_cudnn.cpp

.../hpvm-c/benchmarks/vgg16_cifar10/data/quant_ranges_rt.txt

...arks/hpvm-c/benchmarks/vgg16_cifar10/data/tuner_confs.txt

...chmarks/hpvm-c/benchmarks/vgg16_cifar10/vgg16_cifar10.cpp

...s/hpvm-c/benchmarks/vgg16_cifar10/vgg16_cifar10_cudnn.cpp

...hpvm-c/benchmarks/vgg16_cifar100/data/quant_ranges_rt.txt

...rks/hpvm-c/benchmarks/vgg16_cifar100/data/tuner_confs.txt

...marks/hpvm-c/benchmarks/vgg16_cifar100/vgg16_cifar100.cpp

...hpvm-c/benchmarks/vgg16_cifar100/vgg16_cifar100_cudnn.cpp

...hpvm-c/benchmarks/vgg16_imagenet/data/quant_ranges_rt.txt

...rks/hpvm-c/benchmarks/vgg16_imagenet/data/tuner_confs.txt