add postLs1 fast-sim workflows
add steps for postLs1 fast-sim: GEN-SIM and HARV
Merge pull request #2302 from franzoni/from-CMSSW_7_0_0_pre12-add-postLs1-fastSim

Configuration updates -- Add post ls1 workflows for FastSim
Merge remote branch 'origin/CMSSW_7_0_X' into CMSSW_7_0_X