update migration

ansible/migrate-systemd.yaml

 ---
-- hosts: wg
+- hosts: switch
   vars:
     services: []
   tasks:
@@ -20,9 +20,19 @@
           WantedBy=multi-user.target
         dest: /etc/systemd/system/railgun-global-setup.service
       register: global_systemd_result
+    - name: global-postup systemd disable
+      become: true
+      systemd:
+        name: railgun-global-setup
+        enabled: false
+        daemon_reload: true
     - name: global-postup systemd enable
       become: true
       systemd:
         name: railgun-global-setup
         enabled: true
         daemon_reload: true
+    - name: remove a rubbish
+      file:
+        path: /etc/systemd/system/mutli-user.target.wants
+        state: absent