Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - Merge "fix etcd startup arguments"
  - fix etcd startup arguments

    Change-Id: I34c399b309986fc7bfb25af8104843ec9b9dd9c0
    Signed-off-by: Di Xu <di.xu@arm.com>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index 3b38798..fca5504 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit 3b387984b55e9f84f5a7ca1421d722964e088ba1
+Subproject commit fca5504bcb2f14ad36d9a29658a6a7c96c29d8bc