Add shutdown command to Huawei interface template and update configuration files

- Included the `shutdown` command in the Huawei interface template to manage interface states.
- Added a new interface configuration in `config.conf` with the `shutdown` command.
- Updated the expected output JSON to reflect the new interface and its shutdown state for accurate testing and validation of configurations.

tests/fixtures/huawei/config.conf

@@ -30,6 +30,17 @@ interface GigabitEthernet0/0/33
  storm-control multicast min-rate 1000 max-rate 2000
  storm-control action error-down
 #
+interface GigabitEthernet1/0/43
+ description FREE
+ shutdown
+ port link-type access
+ port default vlan 102
+ loopback-detect enable
+ stp disable
+ storm-control broadcast min-rate 1500 max-rate 2500
+ storm-control multicast min-rate 1000 max-rate 2000
+ storm-control action error-down
+#
 interface Vlanif120
  description SSH
  ip address 10.26.196.254 255.255.255.0