We fixed https://issues.redhat.com/browse/RHELC-16 in https://github.com/oamg/convert2rhel/pull/627/

There's one thing about the fix that should be reworked a little bit:

Doing a restore, and then remove of the file here: https://github.com/oamg/convert2rhel/pull/627/files#diff-51e9ff11d39778d3b26778b293fc350430a82e2feed0dab2938da7c0069ffdc6R183

Is a bit unclean.  It would be better if the backup functionality only had to be used for backup and rollback instead of also being used here to temporarily restore a file that was removed as part of package removal.

I think we can clean this up and remove the `restore()` and `remove()` of the file by changing how we backup and remove the repofile packages.  If we split that into two steps (backup and remove), we can then perform the backup portion earlier ( https://github.com/oamg/convert2rhel/pull/627/files#diff-7d31913eebe96d308744cc192ecf12ed870f425d573064d6e5dad3b53381ecc4R223 ) and do the removal later ( https://github.com/oamg/convert2rhel/pull/627/files#diff-7d31913eebe96d308744cc192ecf12ed870f425d573064d6e5dad3b53381ecc4L229 )

By doing that, the repository packages (and the specific os-release file that we need) will still be present when subscription.register_system() is called so we won't have to mess with trying to restore the file via the backup framework.