Avoid creating k8s cert dir on non-k8s nodes (#4602)

roles/kubernetes/preinstall/tasks/0050-create_directories.yml

@@ -29,6 +29,7 @@
     dest: "{{ kube_cert_compat_dir }}"
     state: link
   when:
+    - inventory_hostname in groups['k8s-cluster']
     - kube_cert_dir != kube_cert_compat_dir
 
 - name: Create cni directories