switch postLs1 GEN-SIM input to be with geometry updated as in pre6 (was: geometry of pre5)
Merge pull request #3587 from franzoni/from-CMSSW_7_1_0_pre7_postLS1_GEN-SIM_geom_pre6

Configuration/PyReleaseValidation -- postLs1 GEN-SIM input to be w/ pre6  geometry