Sweeping !26444 from master to 21.0. Updating diff_root_files.py to look for 'EventInfoAux.'Closes ATLASRECTS-5115 (!26518) · Merge requests · atlas / athena · GitLab

Atlas Nightlybuild requested to merge cherry-pick-3fcb33ec11-21.0 into 21.0 Sep 12, 2019

Updating diff_root_files.py to look for 'EventInfoAux.'

Closes ATLASRECTS-5115

See merge request !26444 (merged)