Add shutdown command to Qtech interface template and update expected configuration files

- Included the `shutdown` command in the Qtech interface template to manage interface states.
- Updated expected output JSON files to set the `shutdown` attribute to true for accurate testing and validation of interface configurations.

tests/fixtures/qtech/config_2.expected.json

@@ -7,7 +7,7 @@
   "interfaces": [
     {
       "interface": "GigaEthernet1/0/9",
-      "shutdown": false,
+      "shutdown": true,
       "ip_address": null,
       "mask": null,
       "description": "FREE"