CMSSW_9_3_9

Changes since CMSSW_9_3_8_patch1:

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CMSDIST Changes between Tags REL/CMSSW_9_3_8_patch1/slc6_amd64_gcc630 and REL/CMSSW_9_3_9/slc6_amd64_gcc630:

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  1. 3932 from @cms-sw: Update pythia8.spec created: 2018-04-18 22:43:21 merged: 2018-04-19 19:22:47