This commit was modified by William Hubbs as follows:
- The paths in the cgroup fs were put into variables to ease
maintenance.
- Documentation was added to rc.conf.Linux.
- The services were added originally to openrc/svcname cgroups under the
controller cgroups, but this left an "openrc" cgroup which was unused.
Now they are added to individual cgroups with the name openrc_${RC_SVCNAME}.
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