MPI Replay: Establish a configuration workflow with and without QoS

[nmcglo]

Branch: Develop

Currently the mpi replay workload configuration file requires four items per workload (line). Previously this had been 2.

Can we come up with a way to allow for both 2 and 4 item configuration files?

Also, what should the s->qos_level be if QoS is not enabled, because using -1 for this instantiation will break the "single job no config file needed" way of executing codes. I've currently set it to 0 to work around this but that may not be a long term solution.