Migrated the L2MuonIsolatorProducer to consumes.
In order to do so the MuonIsolatorFactory (from RecoMuon/MuonIsolation)
as well as the MuIsoBaseIsolator base class were updated to deal with ConsumesCollector.
Merge pull request #3184 from battibass/l2MuonIsolatorProducerConsumes

Reco -- The L2MuonIsolatorProducer was migrated to consumes.