This appears to be the same thing we saw in Fedora with
Id24196791f80cd99fe8a330fb2c7c6d893fc9995, somehow upstream
directories have started acquiring a setgid bit, which breaks AFS
mirroring
rsync: failed to set permissions on "/afs/.openstack.org/mirror/centos/8/AppStream/aarch64/os": Permission denied (13)
and when we look
chmod("AppStream/aarch64/os/Packages", 02755) = -1 EACCES (Permission denied)
Drop the "-p" so we don't try and replicate these permissions.
Change-Id: Ib5db052cdd23e39aecbeead15cf08d4bd7fcab38