Muon DQMOffline fix thread un safe

Removed some unused class (MuonAnalyzerBase) , migrated to support multithread DTsegmentTask and remove thread_unsafe for the EfficiencyAnalyzer (I think is was tagged unsafe by mistake)
Does this module directly or indirectly use the MuonServiceProxy?  If so, this needs to remain thread unsafe since the MuonServiceProxy is not safe.