xendriverdomain: use POSIX sh and not bash

The script doesn't use any bash-isms and works fine with BusyBox's ash.

Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>

tools/hotplug/Linux/init.d/xendriverdomain.in

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # xendriverdomain    Script to start services needed in a Xen driver domain
 #