Description:
The wrapper currently outputs data from each job within a run to the data point's fio-result.json, then calculates averages for eventual inclusion in the run results (see obtain_avg and obtain_avg_lat. Use of Fio's --group_reporting option consolidates the output data into a single sum/average depending on metric, removing the need to have the wrapper do some of the calculations (why do ourselves what the wrapper can give us for free).

Note:
This change should be done in conjunction with the coming validation/visualization updates, to consolidate the breakage of backward compatibility between results files.