CMSSW_7_1_33

Changes since CMSSW_7_1_32_patch1:

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CMSDIST Changes between Tags REL/CMSSW_7_1_32_patch1/slc6_amd64_gcc481 and REL/CMSSW_7_1_33/slc6_amd64_gcc481:

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1. 3979 from @cms-sw: pythia8: initialize bools created: 2018-05-07 14:57:03 merged: 2018-05-09 07:10:38