Enable to get the precise gpu_time for tf by using ctypes package to load libcudart.so and add add nchw support for batch_norm.#1237
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该PR主要包括以下工作：
添加控制benchmark行为的
BENCHMARK_NEED_FEED和BENCHMARK_NEED_FETCH两个环境变量，并且在BENCHMARK_NEED_FETCH开启时，解析nvprof log时会减掉DtoH的时间更新tf支持的版本到最新版本2.7.0