Backport #9218: Backport #8622 "CentOS 8 BaseOS .treeinfo's [general] section says AppStream instead of BaseOS" to 3.14.z
Mirrored .treeinfo metadata needs to be rewritten in cases where the relative location of the sub-repos moved
When .treeinfo contains relative paths to a location outside of the repository, as is the case with CentOS 8, Pulp cannot serve those sub-repos precisely as they are. So it syncs all of them and publishes all of them into one repository with subdirectories for the sub-repos, and writes the locations of these sub-repos into the .treeinfo metadata.
In the mirrored metadata case, the .treeinfo file will be pointing to the wrong locations, so we need to rewrite the .treeinfo file just like we do during a standard publish.
As .treeinfo isn't checksummed or signed we aren't prevented from doing this.
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