Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - add scenario description for os-nosdn-stor4nfv-ha

    Change-Id: I982164682f7567110d1e46ed07a8d96dfe9239e3
    Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index cefd1d0..56bf481 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit cefd1d0854ee948acc7147834146914983a11556
+Subproject commit 56bf48111d4e7f0664789f5b6a567ce2c66d0b8b