Updated openHLT2PAT.TEMPLATE to work in CMSSW_5_3_14

- previous openHLT2PAT.TEMPLATE is renamed to openHLT2PAT_5_3_11.TEMPLATE
- implemented latest MVA and No-PU MET algorithms (see metPUSubtraction_cff.py)
- synchronized onlyPAT.py with openHLT.py