fix pct complete in get_mcm

Kevin Pedro requested to merge github/fork/kpedro88/FixMcmPct into Run2_2017

We found that req['total_events'] from the miniAOD request did not have the correct value, leading to inaccurate percentages. Instead, we will use igs['total_events'] from the corresponding GEN-SIM request, which seems to be correct. (This is based on comparisons to the dmytro production status website.)

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