Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - Add cindercompatibleapi binary file

    This patch is proposed for adding cindercompatibleapi
    binary file in ci/bin folder, so that downstream
    projects can directly download this file in OpenStack
    scenario.
    Besides, some installation docs are also updated
    according to these changes.

    Change-Id: I92a341978379078216c220a9e84d47461d5a13d5
    Signed-off-by: leonwang <wanghui71@huawei.com>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index 91a8433..401c7f3 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit 91a84330494b100ac9077652c910fb248f737717
+Subproject commit 401c7f3eae51c8bdf95fc8a2c4232969ac1f0b2f