message: add getter for DriftCDBentry
diff: @@ -55,6 +55,7 @@ public:
  void MakeDefaultPlots(TObjArray * const arr, TObjArray *picArray);
  void SetMaxVDriftCorr(Double_t maxVDriftCorr=0.03) {fMaxVdriftCorr=maxVDriftCorr;};
  Bool_t ValidateTimeDrift();
  + AliCDBEntry* GetDriftCDBentry() const { return fDriftCDBentry; }
  //
  // Gain part
  