Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - init docs directory

    This patch creates docs directory and add initial release notes.

    Change-Id: I22e53d9d1a5124186416fe0044769fabd634253c
    Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index 7da45d6..6018fcd 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit 7da45d65be36d36b880cc55c5036e96c24b53f00
+Subproject commit 6018fcdd41c2074b2c94d8033f1434be028b054b