Add --quiet to instance-templates delete.

cluster/gce/util.sh

@@ -498,7 +498,7 @@ function create-node-template() {
   #                 distinguish an ephemeral failed call from a "not-exists".
   if gcloud compute instance-templates describe "$template_name" --project "${PROJECT}" &>/dev/null; then
     echo "Instance template ${1} already exists; deleting." >&2
-    if ! gcloud compute instance-templates delete "$template_name" --project "${PROJECT}" &>/dev/null; then
+    if ! gcloud compute instance-templates delete "$template_name" --project "${PROJECT}" --quiet &>/dev/null; then
       echo -e "${color_yellow}Failed to delete existing instance template${color_norm}" >&2
       exit 2
     fi