Add shutdown command to H3C interface template and update related configuration files

- Included the `shutdown` command in the H3C interface template to reflect the new interface state management.
- Updated the `config.conf` file to include the `shutdown` command for the `HundredGigE1/0/3` interface.
- Modified the expected output JSON to set the `shutdown` attribute to true, ensuring accurate testing and validation of interface configurations.

oxi/interfaces/models/templates/h3c.ttp

@@ -23,6 +23,7 @@ default_system = {
 interface {{ interface }}
  description {{ description | ORPHRASE }}
  ip address {{ ip_address }} {{ mask | to_cidr }}
+ shutdown {{ shutdown | set(True) }}
 </group>
 
 <group name="vlans">