🚨 Renaming of some net-* components

Related issue: knative/networking#448

As part of our efforts to GA/1.0 we've standardized on the naming of our networking plugins that are installed along side Serving. If you're managing your Knative deployment manually with kubectl this will require a two-phase upgrade process.

Upgrade of net-http01 to v0.24.0

# Apply the new release
$ kubectl apply -f net-http01.yaml

# Once the deployment is ready delete the old resources
$ kubectl delete deployment http01-controller -n knative-serving
$ kubectl delete service challenger -n knative-serving