Minimal (temporary) solution to automatically switch between 25ns and 50ns configs in ecal local reco

Minimal, but temporary solution which puts the isRealData call directly in the ecal local reco (and reads the pileupSummaryInfo in the mc case)

Default bunchspacing for no OOT pileup needed to be changed for both fullsim and fastsim (should have no physics effect, but changes what gets written in the pileupSummaryInfo)

Any cleaner solution should go in the direction of the desired long term solution (ie fixing properly https://github.com/cms-sw/cmssw/pull/6281 )