systemd and cgroups: heads up

[Matthew Miller]

If you are using the libcgroup package, and in particular the cgconfig
serivice, be aware that this will break systemd. This package is pulled into
Fedora by policycoreutils, so you likely have it on your system. However,
cgconfig is not enabled by default.

https://bugzilla.redhat.com/show_bug.cgi?id=626794