Update metrics-server to v0.7.2

Author: hakman

upup/models/cloudup/resources/addons/metrics-server.addons.k8s.io/k8s-1.11.yaml.template

@@ -145,7 +145,7 @@ spec:
 {{ if WithDefaultBool .MetricsServer.Insecure true }}
         - --kubelet-insecure-tls
 {{ end }}
-        image: {{ or .MetricsServer.Image "registry.k8s.io/metrics-server/metrics-server:v0.7.1" }}
+        image: {{ or .MetricsServer.Image "registry.k8s.io/metrics-server/metrics-server:v0.7.2" }}
         imagePullPolicy: IfNotPresent
         livenessProbe:
           failureThreshold: 3