Update git submodules

Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - Update the latest version of ansible script

    This patch is proposed for merging the latest version of
    ansible code according to opensds-installer project.
    From the latest version code, we change the default
    installation way from source code to release, which means
    there is no need for golang environment prepare and
    long-time building work.

    Change-Id: I93d7d24f29e61979bc8fda7125ae753063eda423
    Signed-off-by: leonwang <wanghui71@huawei.com>