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For ROOT-based SharedWriter, handle short jobs with multiple files.

Peter Van Gemmeren requested to merge gemmeren/athena:AthenaSharedIO_ShortMultiStream into master

With short AthenaMP jobs, some clients finalize before others send their first cluster of data. This causes the SharedWriter to shut down the ROOT merger early and later workers hang. This MR introduces changed to keep the ROOT merger up until receiving event data from all clients (on at least one output file).

Edited by Peter Van Gemmeren

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