iproute2 rules aren't cleaned up when interface is brought down with ifdown.

Issue

• iproute2 rules aren't cleaned up when interface is brought down with ifdown
• The iproute rules that we've configured in /etc/sysconfig/network-scripts/rule-<interface> aren't cleaned up when we do an ifdown on the interface.
• We do have the NetworkManager-dispatcher-routing-rules package installed so that the routes and rules are configured properly when interfaces come up and down.
• It's just that the rules aren't cleaned up when the interface goes down with either an ifdown or systemctl restart network