Add BeamSpotFixerAlg for non-MT pile-up digi

Tadej Novakrequested to merge
tadej/athena:digi-beamspot into master

Add BeamSpotFixerAlg for non-MT pile-up digi. PileUpEventLoopMgr is now configured to setup a temporary xAOD::EventInfo object which is later deep-copied and fixed with proper beam spot data. Overlay has also been updated for consistency.

Part of ATLASSIM-4715.

/cc @mduehrss @jchapman

Edited by Tadej Novak

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