check kube_pods_subnet and kube_service_addresses to valid ip network range, not single ip address (#4188)

roles/kubernetes/preinstall/tasks/0020-verify-settings.yml

@@ -160,15 +160,15 @@
 - name: "Check that kube_service_addresses is a network range"
   assert:
     that:
-      - kube_service_addresses | ipaddr
-    msg: "kube_service_addresses is not a valid network range"
+      - kube_service_addresses | ipaddr('net')
+    msg: "kube_service_addresses = '{{ kube_service_addresses }}' is not a valid network range"
   run_once: yes
 
 - name: "Check that kube_pods_subnet is a network range"
   assert:
     that:
-      - kube_pods_subnet | ipaddr
-    msg: "kube_pods_subnet is not a valid network range"
+      - kube_pods_subnet | ipaddr('net')
+    msg: "kube_pods_subnet = '{{ kube_pods_subnet }}' is not a valid network range"
   run_once: yes
 
 - name: "Check that kube_pods_subnet does not collide with kube_service_addresses"