Update git submodules

* Update docs/submodules/stor4nfv from branch 'stable/fraser'
  - userguide

    Change-Id: Id22c6199f5a6d821d652f79cf07de3d899823352
    Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>
    (cherry picked from commit febcef6118cdc8f9e5a21969c7a8d8d9637dbc14)

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index 1892f36..3f654aa 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit 1892f3672a2bbe8d0a7d8b3cdb5687d9e0208e4d
+Subproject commit 3f654aa9b1e19eb9d84b0632a5bc1e7bde96c281