Prevent failing DNS requests on shutdown of CoreDNS pods

Adopt changes from coredns/helm#204

Author: jan-kantert

upup/models/cloudup/resources/addons/coredns.addons.k8s.io/k8s-1.12.yaml.template

@@ -68,7 +68,7 @@ data:
     .:53 {
         errors
         health {
-          lameduck 5s
+          lameduck 10s
         }
         ready
         kubernetes {{ KubeDNS.Domain }}. in-addr.arpa ip6.arpa {
@@ -219,6 +219,9 @@ spec:
           successThreshold: 1
           failureThreshold: 5
         readinessProbe:
+          periodSeconds: 5
+          timeoutSeconds: 5
+          failureThreshold: 1
           httpGet:
             path: /ready
             port: 8181