utils: add name attribute to FakeDevice class.

When an error occurs trying to parse the dp values into the
matched entity, the error handling is throwing an exception
because it is trying to output a log message mentioning the
device name.  Provide a dummy name so it has something to
log.

util/config_match.py

@@ -12,6 +12,9 @@ class FakeDevice:
     def get_property(self, id):
         return self._dps.get(id)
 
+    @property
+    def name(self):
+        return "cmdline"
 
 def main() -> int:
     dps = json.loads(" ".join(sys.argv[1:]))

util/match_against.py

@@ -15,6 +15,9 @@ class FakeDevice:
     def get_property(self, id):
         return self._dps.get(id)
 
+    @property
+    def name(self):
+        return "cmdline"
 
 def main() -> int:
     dps = json.loads(" ".join(sys.argv[2:]))