Updated the mean sampling interval for mongodb diurnal workload.
Updated the mean sampling interval for mongodb diurnal workload.

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