Optimize single node kind cluster

Recommended by kubernetes/minikube#5682

Author: howardjohn

prow/config/default.yaml

@@ -16,6 +16,11 @@ kubeadmConfigPatches:
       local:
         # Run etcd in a tmpfs (in RAM) for performance improvements
         dataDir: /tmp/kind-cluster-etcd
+    # We run since node, drop leader election to reduce overhead
+    controllerManagerExtraArgs:
+      leader-elect: "false"
+    schedulerExtraArgs:
+      leader-elect: "false"
     apiServer:
       extraArgs:
         "service-account-issuer": "kubernetes.default.svc"