Add ignore_assert_errors to "kube-master, ... (#4779)

... kube-node or etcd is empty" task
As a assert must be ignored if ignore_assert_errors is true

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

@@ -7,6 +7,7 @@
     - kube-node
     - etcd
   run_once: true
+  ignore_errors: "{{ ignore_assert_errors }}"
 
 - name: Stop if non systemd OS type
   assert: