Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Merge "Uplifting docs to D-3"
  - Uplifting docs to D-3

    Change-Id: Iff2f924886bae8e4bf84f4325cde3d7f8546b487
    Signed-off-by: tomsou <soth@intracom-telecom.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 92e86d8..3ce7e4e 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 92e86d8a193af46605ad888bc4f075d006b50a87
+Subproject commit 3ce7e4e7d64007f4c242885b13766f4440bc533c