Added OOT PU for HCAL, and updated JEC for Reco and HLT in GTs for pre6

[diguida]

New Global Tags containing:

• New OOT PU subtraction for HCAL for Run1 and Run2 simulation (both ideal and realistic) and data GT (actually disabled via dummy payload in Run1 simulation and data);
• Updated Jet energy corrections for Reconstruction (Run2 simulation and data GT) and HLT (Run1 and Run2 simulation and data GT), see: https://indico.cern.ch/event/294025/contribution/5/material/slides/0.pdf
• Updated ECAL weights for Run2 for simulation Global Tags
• Updated simulation geometry for Run1 (ExtendedTest2014 scenario) for material budget studies.

[cmsbuild]

A new Pull Request was created by @diguida (Salvatore Di Guida) for CMSSW_7_2_X.

Added OOT PU for HCAL, and updated JEC for Reco and HLT in GTs for pre6

It involves the following packages:

Configuration/AlCa

@cmsbuild, @diguida, @rcastello, @cerminar, @nclopezo can you please review it and eventually sign? Thanks.
@ghellwig this is something you requested to watch as well.
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[diguida]

@ggovi @apfeiffer1 I have kept the Global tag customisation for CondDBv2 where L1T tags are read from CondDBv1. If you have successfully migrated the L1T keys to point to the correct payloads in the new DB (as I understood from previous conversation) I can remove this feature.

[diguida]

@davidlange6 This supersedes #5268