Add DQM modules for single lepton+HT SUSY triggers

Replacing pull request #6434 to avoid problematic rebase.

PR adds DQM modules for single lepton+HT SUSY triggers not included in #6255:
HLT_Ele15_IsoVVVL_BTagtop8CSV07_PFHT400
HLT_Ele15_IsoVVVL_PFHT400_PFMET70
HLT_Ele15_IsoVVVL_PFHT600
HLT_Ele15_PFHT300
HLT_Mu15_IsoVVVL_BTagCSV07_PFHT400
HLT_Mu15_IsoVVVL_PFHT400_PFMET70
HLT_Mu15_IsoVVVL_PFHT600
HLT_Mu15_PFHT300
Done; I've made them into configurable parameters.

If the b-tagging thresholds are defined somewhere in CMSSW, the using that definition would be preferable, but a quick search didn't turn up anything. I agree making them parameters is at least better than hard-coding them though.