kubemci does not work with clusters with enabled network endpoint group

[bbcelly]

Trying to run kubemci on cluster with enabled network endpoint group ends with error

Determining instance groups for cluster xxx-cluster
Fetching instance group: xxx-group
Fetched instance group: xxx-group, got named ports:
Error: Error in creating load balancer: 1 error occurred:

* No named ports found. Can not continue

Tried to look into code and found, that there is no support for NEG enabled clusters. In https://github.com/GoogleCloudPlatform/k8s-multicluster-ingress/blob/master/app/kubemci/pkg/gcp/loadbalancer/loadbalancersyncer.go#L109 code only cares about Instance Groups.