Removed legacy benchmarks

...hmarks/legacy/mobilenet_shallow/src/mobilenet_shallow.cpp

...egacy/mobilenet_shallow/src/mobilenet_shallow_promise.cpp

...t/dnn_benchmarks/benchmarks/legacy/pipeline_gsme/Makefile

...arks/benchmarks/legacy/pipeline_gsme/data/tuner_confs.txt

...rks/benchmarks/legacy/pipeline_gsme/src/pipeline_gsme.cpp

...hmarks/benchmarks/legacy/promise_src/alexnet2_promise.cpp

...enchmarks/legacy/promise_src/alexnet_imagenet_promise.cpp

...chmarks/benchmarks/legacy/promise_src/alexnet_promise.cpp

...rks/benchmarks/legacy/promise_src/lenet_mnist_promise.cpp

...marks/benchmarks/legacy/promise_src/mobilenet_promise.cpp

...hmarks/benchmarks/legacy/promise_src/resnet18_promise.cpp

.../benchmarks/legacy/promise_src/vgg16_cifar100_promise.cpp

...s/benchmarks/legacy/promise_src/vgg16_cifar10_promise.cpp