Fix for using Type traitlet

IPython/kernel/zmq/kernelapp.py

@@ -315,7 +315,7 b' class IPKernelApp(BaseIPythonApplication, InteractiveShellApp,'
         shell_stream = ZMQStream(self.shell_socket)
         control_stream = ZMQStream(self.control_socket)
         
-        kernel_factory = import_item(str(self.kernel_class))
+        kernel_factory = self.kernel_class
 
         kernel = kernel_factory(parent=self, session=self.session,
                                 shell_streams=[shell_stream, control_stream],