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fillBarcodesAttribute call in GenModule

Matthew Gignac requested to merge genmodule-fill-barcodes into master

Barcode (and vertex) maps are empty in HepMC3. This MR calls HepMC::fillBarcodesAttribute within GenModule, such that these are filled for all generators inheriting from GenModule. Since the xAODTruthCnvAlg has recently migrated to loop over the barcode map to fill TruthParticles (link), these empty maps resulted in empty xAOD truth containers.

Tagging @ewelina, @averbyts , @dhirsch

Edited by Matthew Gignac

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