CMSSW_9_3_15_patch2

Changes since CMSSW_9_3_15_patch1:

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1. 26904 from @KIT-CMS: Backport HTXS Stage1.1 producer and filter to 93X generators created: 2019-05-23 14:54:56 merged: 2019-07-02 13:10:08

CMSDIST Changes between Tags REL/CMSSW_9_3_15_patch1/slc6_amd64_gcc630 and REL/CMSSW_9_3_15_patch2/slc6_amd64_gcc630:

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