fix bugs in mpc demo

python/paddle_fl/mpc/examples/mnist_demo/mnist_demo.py

-# coding=utf-8
 # Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

python/paddle_fl/mpc/examples/mnist_demo/run_standalone.sh

-#!/bin/bash
+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
 #
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
 # A tools to faciliate the parallel running of fluid_encrypted test scrips.
 # A test script is EXPECTED to accepted arguments in the following format:
 #

python/paddle_fl/mpc/examples/uci_demo/run_standalone.sh

-#!/bin/bash
+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
 #
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
 # A tools to faciliate the parallel running of fluid_encrypted test scrips.
 # A test script is EXPECTED to accepted arguments in the following format:
 #