Enabling ECAL DQM to run on GED clusters

This pull request goes on top of #1834 and edits a file newly introduced there
(RecoEgamma/Configuration/python/customizeOldEGReco.py)

Additionally the DQM modules were modified to take edm::View<reco::CaloCluster> instead of reco::BasicClusterCollection to be compatible with PFClusters.