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AnalysisTop: Fix reading metadata in AodMetaDataReader.py

Oliver Majersky requested to merge omajersk/athena:AodMetaDataReader-workaround into master

This fixes a bug in AodMetaDataReader.py that reads some metadata from MetaData tree in derivations which we need at a later stage.

The bug stems from the fact that, we re-create a portion of the class IOVPayloadContainer only available in athena to be able to read the metadata in AnalysisBase. The corresponding AttrListTypes enum was wrongly implemented, causing wrong determination of data type of the attribute being read.

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