Moving deprecated sourcs to ./dnn_sources/legacy/tests

...sor-rt/dnn_sources/src/legacy/test/alexnet2_approxhalf.cc

...tensor-rt/dnn_sources/src/legacy/test/alexnet2_sampsim.cc

...-rt/dnn_sources/src/legacy/test/alexnet_cifar10_approx.cc

...sor-rt/dnn_sources/src/legacy/test/alexnet_cifar10_old.cc

...sor-rt/dnn_sources/src/legacy/test/depthwise_batchnorm.cc

...hpvm-tensor-rt/dnn_sources/src/legacy/test/lenet2_tanh.cc

...hpvm-tensor-rt/dnn_sources/src/legacy/test/lenet_front.cc

...hpvm-tensor-rt/dnn_sources/src/legacy/test/lenet_int32.cc

...pvm-tensor-rt/dnn_sources/src/legacy/test/lenet_layers.cc

...vm-tensor-rt/dnn_sources/src/legacy/test/mobilenet_old.cc

...nsor-rt/dnn_sources/src/legacy/test/mobilenet_shallow2.cc

.../dnn_sources/src/legacy/test/resnet18_cifar10_cudaperf.cc

...r-rt/dnn_sources/src/legacy/test/resnet18_cifar10_half.cc

...n_sources/src/legacy/test/resnet18_cifar10_inputapprox.cc