fix/ansible 2.19: local vol provisioner: don't rely on final evaluation (#13481)

- also remove mitogen workaround from local_volume_provisioner since
  creating the dirs is handled by kubernetes/preinstall instead
- correct the tag in kubernetes/preinstall as persistent_volumes isn't
  the same thing

roles/kubespray_defaults/vars/main/main.yml

@@ -44,3 +44,11 @@ kube_pods_subnets: >-
   {%- else -%}
   {{ kube_pods_subnet_ipv6 }}
   {%- endif -%}
+
+local_volume_provisioner_storage_classes_default:
+  - key: "{{ local_volume_provisioner_storage_class }}"
+    value:
+      host_dir: "{{ local_volume_provisioner_base_dir }}"
+      mount_dir: "{{ local_volume_provisioner_mount_dir }}"
+      volume_mode: Filesystem
+      fs_type: ext4