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Write xAOD::FileMetaData early to support event service

Frank Berghaus requested to merge berghaus/athena:file_metadata_event_service_fix into master

Tag: @mnowak @tsulaia

In the previous design, the FileMetaDataCreatorTool wrote the FileMetaData object to the MetaDataStore (via the MetaDataSvc) in preFinalize. But in event service a given range of events may be written to file before then. This causes a failure. To support event stream the tool now writes the output FileMetaData object as early as possible.

Edited by Frank Berghaus

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