Update git submodules

Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - 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>