Followup from, f34380d5b5 and
3a1765a5a8, copied to the rest of the RHEL
distro definitions.
For now, these customizations have no effect on the manifest.
The new `with-users` variants of the edge-installer test cases include
the user customizations in the blueprint, but the manifests are
(currently) the same as the corresponding base cases.
15243f1dc5