Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - remove the command line for test case

    the cmd-line for k8s test case could not run normally, and so
    remove it here.

    Change-Id: I2188f09139fb41ed68976317bf027ce83053a026
    Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index fcedde9..957abb6 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit fcedde93eb366867ed428d362e2cb8a6b7f28b3c
+Subproject commit 957abb60ddc82354234687328460147e19607caf