Refactor Keenetic model to utilize centralized UTF-8 decoding utility

- Removed the internal `_decode_utf` method from the `Keenetic` class and replaced its usage with the new `decode_utf` utility function for decoding interface descriptions.
- Added a new configuration file `config.conf` for Keenetic devices to facilitate testing.
- Introduced an expected output JSON file `config.expected.json` to validate the parsing of Keenetic configurations against expected results.

oxi/interfaces/models/keenetic.py

@@ -1,24 +1,13 @@
 from ipaddress import ip_interface
 from oxi.interfaces import register_parser
 from oxi.interfaces.base import BaseDevice
+from oxi.interfaces.utils import decode_utf
 
 
 @register_parser(["NDMS", "keenetic", "KeeneticOS"])
 class Keenetic(BaseDevice):
     template = "keenetic.ttp"
 
-    def _decode_utf(self, text: str):
-        if "\\x" in text:
-            desc = text.strip('"')
-            decoded = (
-                desc.encode("utf-8")
-                .decode("unicode_escape")
-                .encode("latin1")
-                .decode("utf-8")
-            )
-            return decoded
-        return text
-
     def interfaces(self):
         interfaces: list[dict] = self.raw["interfaces"]
         for item in interfaces:
@@ -29,7 +18,7 @@ class Keenetic(BaseDevice):
                 item["mask"] = ipaddress.network.prefixlen
                 item.pop("netmask", "Key not found")
             if item.get("description"):
-                decoded = self._decode_utf(item.get("description", ""))
+                decoded = decode_utf(item.get("description", ""))
                 item["description"] = decoded
         return interfaces
 
@@ -37,13 +26,6 @@ class Keenetic(BaseDevice):
         vlans = self.raw["vlans"]
         for item in vlans:
             if item.get("description"):
-                decoded = self._decode_utf(item.get("description", ""))
+                decoded = decode_utf(item.get("description", ""))
                 item["description"] = decoded
         return vlans
-
-
-if __name__ == "__main__":
-    with open("./test2.txt") as file:
-        data = file.read()
-    mikr = Keenetic(data)
-    print(mikr.parse().model_dump_json())