removed all autotuner-related files in test/dnn_benchmarks

hpvm/test/dnn_benchmarks/benchmarks/.gitignore

...arks/alexnet/data/autotuner_data/tuner_confs_batch220.txt

...exnet/data/autotuner_data/tuner_pareto_confs_batch220.txt

...ata/autotuner_data/tuner_promise_confs_batch220_multi.txt

...ta/autotuner_data/tuner_promise_confs_batch220_single.txt

...t/dnn_benchmarks/benchmarks/alexnet/data/quant_ranges.txt

...nn_benchmarks/benchmarks/alexnet/data/quant_ranges_rt.txt

...dnn_benchmarks/benchmarks/alexnet/data/run_data/out-run-1

...st/dnn_benchmarks/benchmarks/alexnet/data/tuner_confs.txt

...n_benchmarks/benchmarks/alexnet/data/tuner_confs_base.txt

.../dnn_benchmarks/benchmarks/alexnet/predictive/alexnet.txt

...rks/alexnet2/data/autotuner_data/tuner_confs_batch220.txt

...xnet2/data/autotuner_data/tuner_pareto_confs_batch220.txt

...ata/autotuner_data/tuner_promise_confs_batch220_multi.txt

...ta/autotuner_data/tuner_promise_confs_batch220_single.txt

.../dnn_benchmarks/benchmarks/alexnet2/data/quant_ranges.txt

...n_benchmarks/benchmarks/alexnet2/data/quant_ranges_rt.txt

...nn_benchmarks/benchmarks/alexnet2/data/run_data/out-run-1

...t/dnn_benchmarks/benchmarks/alexnet2/data/tuner_confs.txt

.../dnn_benchmarks/benchmarks/alexnet2/data/tuner_confs2.txt