[releng] Issue #6739: F26 Alpha image paths and CHECKSUM files changed partially from underscore to dash

[Kellin]

kellin added a new comment to an issue you are following:
``
@syeghiay this is fixed in F26 through F28.

Our process here is slightly fragile, opened [taiga card
#1012](https://taiga.fedorainfracloud.org/project/acarter-fedora-docker-atomic-tooling/us/1012)
so we can work toward a more durable solution that has less potential for human error.
``

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https://pagure.io/releng/issue/6739