Two changes to run script:
Two changes to run script:

1. Calculates the absolute path for proj_dir
2. Parallel commands are refactored in a way that allows rsync to be parallel.

XiaoqingWang/spark-perf,Altiscale/spark-perf,mengxr/spark-perf,nchammas/spark-perf,zsxwing/spark-perf,mengxr/spark-perf,Altiscale/spark-perf,XiaoqingWang/spark-perf,feynmanliang/spark-perf,databricks/spark-perf,jkbradley/spark-perf,arijitt/spark-perf,zsxwing/spark-perf,feynmanliang/spark-perf,databricks/spark-perf,nchammas/spark-perf,arijitt/spark-perf,jkbradley/spark-perf