new FastSim PU workflow for 13 TeV
Update the recycle GEN-SIM from CMSSW_7_1_0_pre6_PRE_LS171_V3
Merge pull request #3443 from srimanob/New_Recycle_GEN-SIM

Configuration/PyReleaseValidation -- New workflow for FastSim PU @ 13 TeV + New recycle GEN-SIM from 710pre6