Remove EAD XML keymap matching, Refs #9992
Remove EAD XML keymap matching, Refs #9992

The commit removes the XML keymap matching logic. This code did not work as
expected due to issues with uniqueness of the keys used and is currently
causing issues testing --delete-and-replace with --skip-unmatched.

artefactual/atom,artefactual/atom,artefactual/atom