Update stor4nfv install scripts according to opensds aruba release

Since OpenSDS has published its aruba release and also supports
OpenStack scenario, this patch is designed for updating stor4nfv
code to prepare for integrating Compass4NFV and Apex installer on
OpenStack scenario.
Besides the large code changes, some tutorial docs are also added
or updated for better installing this project.

Change-Id: I1e4fec652c6c860028ef39448bc323839f3aa95c
Signed-off-by: leonwang <wanghui71@huawei.com>