Further hlt integrations post frozen version for steam

This pull request allow in the Run2 HLT menu the paths from the following JIRA tickets:
- CMSHLT-151: EXO Monojets (in master table an GRun)
- CMSHLT-161: Electron + HT cross trigger (in mster table only)
- CMSHLT-166: Photon + HT path for SUSY (in master table an GRun) 
- CMSHLT-167; Double Lepton + HT triggers for SUSY (in mster table only)

Further: cleanup explicit GT payloads