This fixes the default:true for multiple interface returns from CNI for cluster default network, where all interfaces in that return were marked as default:true in the network-status
coverage: 64.048% (+0.2%) from 63.857%
when pulling 38d03eb816de9d48829b56e56e4a22cbfa59b7cc on dougbtv:net-attach-def-client-v172
into b554c96160ae5a812c7c3854505ec0af65be45d0 on k8snetworkplumbingwg:master.
This fixes the default:true for multiple interface returns from CNI for cluster default network, where all interfaces in that return were marked as default:true in the network-status