Merge pull request #3505 from ljhrot/develop-issue#3397

[ISSUE #3397]Fix shell syntax error when running in ubuntu

distribution/bin/shutdown.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Copyright 1999-2018 Alibaba Group Holding Ltd.
 # Licensed under the Apache License, Version 2.0 (the "License");

distribution/bin/startup.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Copyright 1999-2018 Alibaba Group Holding Ltd.
 # Licensed under the Apache License, Version 2.0 (the "License");