switch 13 TeV GEN-SIM to CMSSW_6_2_0_patch1-POSTLS162_V1_30Aug2013-v2

- switch 13 TeV GEN-SIM to CMSSW_6_2_0_patch1-POSTLS162_V1_30Aug2013-v2
- this will fix issue in IB's with the beamhalo relval