set longhorn xfs as default fs

roles/longhorn/tasks/helm.yml

@@ -27,6 +27,8 @@
     --set defaultSettings.storageOverProvisioningPercentage={{ longhorn_storage_over_provisioning_percentage }}
     --set defaultSettings.createDefaultDiskLabeledNodes=true
     --set persistence.defaultClassReplicaCount={{ longhorn_default_replica_count }}
+    --set persistence.defaultFsType=xfs
+    --set persistence.defaultClass=true
     --set service.ui.type=ClusterIP
   environment:
     KUBECONFIG: "{{ longhorn_kubeconfig }}"