HiveDataBroker: make dependency resolution deterministic

Gerhard Ravenrequested to merge
deterministic_dependency_order into master

When requesting the producers required for a DataObjIDColl, make sure that the producers are ordered in a deterministic way.

Fixes lhcb/DaVinci#216 (closed), lhcb/DaVinci#215 (closed)

Edited by Gerhard Raven

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