On occasion there are inconsistencies in the CentOS or Ceph RPM
repositories. This can cause `dnf update` to fail when there are
conflicting versions of a package. By adding the `--nobest` option,
packages can get upgraded to an older version, but not the latest.
Signed-off-by: Niels de Vos <ndevos@ibm.com>
(cherry picked from commit d8a040719e0ad491ad144fe361b67e6bd2109710)