Add permissions for {networking,autoscaling}.internal.knative.dev to the namespace admin role (#4605)
Add permissions for {networking,autoscaling}.internal.knative.dev to the namespace admin role (#4605)

This PR is similar to pull/4358.

Currently even namespace's `admin` cannot access to knative resource
such as `networking.internal.knative.dev` and
`autoscaling.internal.knative.dev`.

This patch allows namespace admin to access to the resources within
their namespaces.
knative/serving,knative/serving