GKE upgrade tests

cluster/gce/upgrade.sh

@@ -44,6 +44,7 @@ function usage() {
   echo "(... Fetching current release versions ...)"
   echo ""
 
+  # NOTE: IF YOU CHANGE THE FOLLOWING LIST, ALSO UPDATE test/e2e/cluster_upgrade.go
   local latest_release
   local latest_stable
   local latest_ci
@@ -53,7 +54,7 @@ function usage() {
   latest_ci=$(gsutil cat gs://kubernetes-release/ci/latest.txt)
 
   echo "To upgrade to:"
-  echo "  latest stable: ${0} ${latest_stable}"
+  echo "  latest stable:  ${0} ${latest_stable}"
   echo "  latest release: ${0} ${latest_release}"
   echo "  latest ci:      ${0} ${latest_ci}"
 }

cluster/gke/config-common.sh

@@ -18,7 +18,6 @@
 # Specifically, the following environment variables are assumed:
 # - CLUSTER_NAME  (the name of the cluster)
 
-MASTER_NAME="k8s-${CLUSTER_NAME}-master"
 ZONE="${ZONE:-us-central1-f}"
 NUM_MINIONS="${NUM_MINIONS:-2}"
 CLUSTER_API_VERSION="${CLUSTER_API_VERSION:-}"