Update git submodules

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>