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>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index 63ff6c6..078bb83 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit 63ff6c6ec9ebbca90ac7304a27c0430dbcecb74f
+Subproject commit 078bb837513f3b83fdd07f2e10f9abeb0bd485db