[CentOS] Persisting iproute2 routes and rules

> /etc/syscontfig/network-scripts/rule-ethX
> Check out /etc/sysconfig/network-scripts/ifup-routes to see exactly how
> things are processed.

Sorry, but I can't see how ifup-routes will ever process rule-ethX. A
quick search for "rule" on ifup-routes (on any file in the
network-scripts directory) gets no results.

Routes are OK, though.