HLT JetMET changes from Jia Fu Low and removal of 2011 HLTMhtHtFilter.
JetMET migration for HLT config
More fixes in Ht/HtMht filetrs
More fixes
Merge pull request #2787 from Martin-Grunewald/HLTJetMET

HLTrigger -- Hlt jet met
Merge remote branch 'origin/CMSSW_7_1_X' into CMSSW_7_0_X