Both @satnam6502 and E2E tests confirm: This code is no longer needed

Deletion is wonderful. The only weird thing was where to put the
message about the proxy URLs. Satnam suggested kubectl clusterinfo,
which seemed like a good option to put at the end of cluster turn-up.

cluster/gke/util.sh

@@ -267,11 +267,3 @@ function kube-down() {
   "${GCLOUD}" preview container clusters delete --project="${PROJECT}" \
     --zone="${ZONE}" "${CLUSTER_NAME}"
 }
-
-function setup-logging-firewall {
-  echo "TODO: setup logging"
-}
-
-function teardown-logging-firewall {
-  echo "TODO: teardown logging"
-}