Add upload_and_update.py tool

A tool to upload tarball to TFTP server and update BMC with it, using
REST APIs.

Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/leiyu/obmc-utils/LICENSE b/leiyu/obmc-utils/LICENSE
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+Copyright 2017 IBM Corp.
+
+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.
+