Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - Merge nbp installation into opensds ansible script

    In this update, the nbp-ansible is removed from stor4nfv repo and
    all code has been merged into ansible repo. Besides, the latest
    update reduce a lot of work to download and build opensds source
    code. And some installation docs are also updated.

    Remove license statement for the moment.

    Change-Id: Ib8504d96e2d41e1c3ab7e0c94689111679d56abd
    Signed-off-by: leonwang <wanghui71@huawei.com>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index 6018fcd..6bc7e08 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit 6018fcdd41c2074b2c94d8033f1434be028b054b
+Subproject commit 6bc7e08cc5d80941c80e8d36d3a2b1373f147a05