CMSSW_10_4_0_mtd2_patch1

Changes since CMSSW_10_4_0_mtd2:

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1. 25496 from @pmeridian: Fixes OOTPU for BTLDigitisation. Note that this PR was cherry-picked in to this patch. simulation upgrade created: 2018-12-13 19:43:25 merged: 2018-12-14 15:43:57

CMSDIST Changes between Tags REL/CMSSW_10_4_0_mtd2/slc6_amd64_gcc700 and REL/CMSSW_10_4_0_mtd2_patch1/slc6_amd64_gcc700:

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