Beamspot and vertex smaring for 2017 pp ref (forward port of #33504)#33655

cmsbuild merged 1 commit intocms-sw:mastercms-sw/cmssw:masterfrom

tlampen:beamspot-and-vtxsmearing-for-ppRefULMCtlampen/cmssw:beamspot-and-vtxsmearing-for-ppRefULMCCopy head branch name to clipboard