Add H3C device support with configuration and expected output files

- Introduced support for H3C devices by adding a new configuration file `config.conf` containing interface and VLAN settings.
- Created an expected output JSON file `config.expected.json` to validate the parsing of H3C configurations.
- Updated the test model cases to include H3C for comprehensive testing of device parsing functionality.

oxi/interfaces/models/h3c.py

@@ -14,11 +14,4 @@ class H3C(BaseDevice):
                 vlans.append(item)
                 continue
             vlans.extend({"vlan_id": vlan_id} for vlan_id in vlan_ids)
-        return vlans
-
-
-if __name__ == "__main__":
-    with open("./test5.txt") as file:
-        data = file.read()
-    h3c = H3C(data)
-    print(h3c.parse())
+        return vlans