This commit should fix the group prepare ACL issue

continuousintegration/docker/ctafrontend/cc7/etc/yum/pluginconf.d/versionlock.list

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 1:python3-xrootd-4.8.0-0.rc1.el7.x86_64
 1:xrootd-4.8.0-0.rc1.el7.x86_64