- the new chart uses the default namespace service account, and doesn't require
additional RBAC permissions.

- simplified label structure. Label change is not supported on upgrade.

- for 'internal load balancer' you should deploy a separate gateway, in a different
namespace.

All ingress gateway have a "app:ingressgateway" label, used to identify it as an
ingress, and an "istio: ingressgateway$SUFFIX" label of Gateway selection.