CMSSW_7_1_27

Changes since CMSSW_7_1_26:

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1. 17929 from @Dr15Jones: Report # events per Lumi for output files in framework job report core created: 2017-03-14 17:01:30 merged: 2017-03-27 16:20:39

CMSDIST Changes between Tags REL/CMSSW_7_1_26/slc6_amd64_gcc481 and REL/CMSSW_7_1_27/slc6_amd64_gcc481:

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1. 2985 from @mkirsano: upgrade lhapdf pdf sets to 6.1.6a created: 2017-04-25 17:44:02 merged: 2017-05-09 06:56:46