Knative Net Contour release v0.24.0

🚨 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-contour to v0.24.0

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

# Once the deployment is ready apply the same file but 
# prune the old resources
$ kubectl apply -f net-contour.yaml \
  --prune -l networking.knative.dev/ingress-provider=contour