fix parsing issue for lhe per-event weights
change the runTheMatrix WF used in driver8
Merge pull request #6341 from deguio/fixDriver8

change the runTheMatrix WF used in driver8
Merge pull request #6340 from bendavid/lheweightfix_73x

fix parsing issue for lhe per-event weights
Merge remote branch 'origin/CMSSW_7_3_X' into CMSSW_7_0_X