Add an optional executable binary fs_benchmark_tool, for test the performance of file system such as hdfs, s3.
Usage:
./fs_benchmark_tool --conf my.conf --fs_type=s3 --operation=read --iterations=5
in my.conf, you can add any config key value with following format:
key1=value1
key2=value2
By default, this binary will not be built. Only build it when setting BUILD_FS_BENCHMARK=ON.
The binary will be installed in output/be/lib.
For developer, you can add new subclass of BaseBenchmark to add your own benchmark.
See be/src/io/fs/benchmark/s3_benchmark.hpp for an example
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