Merge branch 'Remove_MA27' into '21.0'
Manual cherry-pick to fix compilation failure in 21.0-mc16a
Remove MA27 and clean up private member variables
See merge request atlas/athenaprivate1!11334
Edited by Walter Lampl
Manual cherry-pick to fix compilation failure in 21.0-mc16a
Remove MA27 and clean up private member variables
See merge request atlas/athenaprivate1!11334