CaloCellDetPos keep only methods that the CaloDetDescrManager is passed.

Merged Christos Anastopoulos requested to merge ATLAS-EGamma/athena:caloDetPos_passDetMgr into master

CaloCellDetPos keep only methods that the CaloDetDescrManager is passed. Modify the Calo D3PD code to use these and retrieve the manager via CondHandle.

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