Modified message emitted by test runner when writing out config file.
Modified message emitted by test runner when writing out config file.

sguazt/rain-workload-toolkit,marmbrus/rain-workload-toolkit,sguazt/rain-workload-toolkit,sguazt/rain-workload-toolkit,mrcaps/rain-workload-toolkit,marmbrus/rain-workload-toolkit,mrcaps/rain-workload-toolkit,yungsters/rain-workload-toolkit,marmbrus/rain-workload-toolkit,mrcaps/rain-workload-toolkit,yungsters/rain-workload-toolkit,yungsters/rain-workload-toolkit