In the job stats, in addition to the max, min and average,
it will also display the standard deviation.
A new option --json is added to the rdci to output the results
in json format.
In the job stats, using the GMT time instead of timestamp
for start and end time.
Change-Id: If245c4fc4854a1dc867f97ff5aa9112af7962eca
[ROCm/rdc commit: e6d910f67a]
Add support for the stats subsystem in rdci
Modify the dmon system to handle the case when no GPUs in a group
Change-Id: I5a18e1201d24b5318b8e324a77551a757b108f25
[ROCm/rdc commit: 096dc2dadb]