Istio's CNI currently runs as a multus, but this causes problems with some integrations when Istio's plugin is the last plugin to run.  This is because Istio's CNI does not contribute a network interface.  Specifying Istio CNI as the first multus plugin works around the problem, but is not a proper solution.  A better solution is to chain it off of the default network provider (OVN-Kubernetes or SDN).

Acceptance Criteria:

• There is no change to existing sidecar networking
• The default route for an interface is not removed