Revert to EventLoopMgr instead of HLTControlFlowManager when using GaudiPython in PyConf

Sebastien Poncerequested to merge
sponce_FastGaudiPython into master

goes together with Moore!3511 (merged)

created on top of !4578 (merged)

HLTControlFlowManager is not efficient enough when looping over events from python and running them one at a time This translated to a limitation of ~10 evts/s compared to ~500 with HLTControlFlowManager

Edited by Sebastien Ponce

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