Fix an issue with default ScriptDeployment script file location being /root
which might not always be writable by ssh user. New location defaults to ssh
user's home directory.

Part of LIBCLOUD-302, reported by "rotem".


git-svn-id: https://svn.apache.org/repos/asf/libcloud/trunk@1453705 13f79535-47bb-0310-9956-ffa450edef68