Code cleanup: GeoModel material managers

Vakhtang Tsulaiarequested to merge
tsulaia/athena:master-materialmanager-cleanup into master

Dropped the redundant AbsMaterialManager interface, and removed all references to this interface from client packages.

Dropped redundant methods from RDBMaterialManager, and in this way got rid of lots of duplicated code.

Edited by Vakhtang Tsulaia

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