Fix some issues with converting names, see #1466

jedi/inference/value/klass.py

@@ -74,8 +74,7 @@ class ClassName(TreeNameDefinition):
             else:
                 yield result_value
 
-    @property
-    def defining_qualified_value(self):
+    def get_defining_qualified_value(self):
         return self._class_value