Use the latest node-cache image.

The image has debian base 2.0.0, some stability fixes and also uses
UDP to connect to stubDomains configured via kube-dns configmap.

Author: prameshj

cluster/addons/dns/nodelocaldns/nodelocaldns.yaml

@@ -140,7 +140,7 @@ spec:
         operator: "Exists"
       containers:
       - name: node-cache
-        image: k8s.gcr.io/k8s-dns-node-cache:1.15.10
+        image: k8s.gcr.io/k8s-dns-node-cache:1.15.13
         resources:
           requests:
             cpu: 25m