increase node size for gke

Author: Hantao (Will) Wang

test/k8s-integration/cluster.go

@@ -20,7 +20,7 @@ func clusterDownGCE(k8sDir string) error {
 
 func clusterDownGKE(gceZone string) error {
 	cmd := exec.Command("gcloud", "container", "clusters", "delete", gkeTestClusterName,
-		"--zone", gceZone, "--quiet")
+		"--zone", gceZone, "--quiet", "--machine-type", "n1-standard-2")
 	err := runCommand("Bringing Down E2E Cluster on GKE", cmd)
 	if err != nil {
 		return fmt.Errorf("failed to bring down kubernetes e2e cluster on gke: %v", err)