Disable nodeport auto allocation

[alexmasi]

Do not allocate a NodePort for this LoadBalancer. MetalLB or the equivalent load balancer should handle exposing this service. Large topologies may try to allocate more NodePorts than are supported in default clusters.

https://kubernetes.io/docs/concepts/services-networking/service/#load-balancer-nodeport-allocation

https://kubernetes.io/docs/concepts/services-networking/service/#type-nodeport (by default <3k services are allowed, with nodes having ~5 services this limits topo size)