IoTDB-Cluster-Benchmark

1. NOTICE: you need to package the source code of iotdb locally first.
2. you can use mvm clean package -DskipTests to package.
3. you can find this benchmark in target/IoTDB-Cluster-Benchmark-0.1
   1. you can edit config file(location: target/IoTDB-Cluster-Benchmark-0.1/conf)
   2. then you can use ./benchmark.sh to run the test.