Update SumEt, PFMET, PFMETNoMu, PFMHT, PFMHTNoMu. Add newly requested paths.

- Monitoring variables:
-- SumEt defined as <PFMET>.SumEt()
-- HT defined as <PFMHT>.SumEt()
-- Add PFMETNoMu and PFMHTNoMu for Monojet trigger path validation

- Add newly requested trigger paths:

-- HTDisplacedJets
HLT_HT500_DisplacedDijet40_Inclusive_v1 (Signal 7 Hz)
HLT_HT350_DisplacedDijet40_DisplacedTrack_v1 (Signal 3 Hz)
HLT_VBF_DisplacedJet40_DisplacedTrack_v1 (Signal 4 Hz)
HLT_VBF_DisplacedJet40_Hadronic_v1 (Signal 4 Hz)
HLT_HT550_DisplacedDijet40_Inclusive_v1 (Backup 2 Hz)
HLT_HT350_DisplacedDijet80_DisplacedTrack_v1 (Backup 2 Hz)
HLT_VBF_DisplacedJet40_TightID_DisplacedTrack_v1 (Backup 3 Hz)
HLT_VBF_DisplacedJet40_TightID_Hadronic_v1 (Backup 2 Hz)

-- SingleMuon
HLT_Mu45_e2p1_v
HLT_Mu50_v

-- PhotonMET
HLT_Photon135_PFMET100_NoiseCleaned_v