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.
Merged refs/pull/3184/head from repository cms-sw
Take the latest hltConfig instead of a fixed one