13-kube-single-master: use Taint based Evictions instead of pod-evict…

…ion-timeout (fixes #2)

NOTE:
  Taint based Evictions timeout starts since the node status changed to NotReady (or Unreachable)
  so it would take 40s in total after the time of the actual failure:
    40s = node-monitor-grace-period(20s) + default-not-ready-toleration-seconds(20s)
  as it's equal to pod-eviction-timeout=40s

roles/kube-single-master/templates/kubeadm-config.yml.j2

@@ -9,6 +9,8 @@ kubernetesVersion: v1.15.3
 apiServer:
   extraArgs:
     advertise-address: {{ NODE_IP }}
+    default-not-ready-toleration-seconds: "20"
+    default-unreachable-toleration-seconds: "20"
 networking:
   podSubnet: {{ POD_NETWORK_CIDR }}
 controllerManager: