Skip ensuring VMSS in pool for nodes which should be excluded from lb
Skip ensuring VMSS in pool for nodes which should be excluded from lb

Such nodes should not be added to backend pools. This has particular impact
for nodes which are not master nodes (such as nodes running an etcd cluster)
and are incorrectly added to the pool prior to this change.

Kubernetes-commit: ee8f9f26b91fd391eff6a7abb67f698904bd6115

kubernetes/legacy-cloud-providers