This is a part of containers CI/CD flow implementation process.

In order to allow having stub repository configuration files as specified in OVIRT-1391, we need to be able to use the "skip_if_unavailable" yum setting. But we don't want this setting to still be in affect once mirror injection happens and the repo configuration points to a real repo. Therefore we need to make the mirror injection process remove this setting for repo configurations into which mirror URLs are injected.