IPs return by CNI plugins no longer "assigned" to a default interface if no interface is provided

[Brian-McM]

What happend:
IPs returned by the CNI plugin that don't have an interface index are dropped and not assigned to any interface in 4.1

What you expected to happen:
These IPs to continue to be assigned to a default interface

How to reproduce it (as minimally and precisely as possible):
Use a CNI plugin that returns IPs without an interface index, like calico

Anything else we need to know?:
This PR changed to use the CreateNetworkStatuses which doesn't have a reasonable default. I've created this issue there to request a reasonable default and fail if the IPs can't be assigned to an interface, instead of dropping them.

Environment:
Multus 4.1

• Multus version: 4.1
• Kubernetes version (use kubectl version): any
• Primary CNI for Kubernetes cluster: calico