Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/euphrates'
  - Merge "Updated from global requirements" into stable/euphrates
  - Updated from global requirements

    Change-Id: I98eac765058ebd636347f14c7ebde2a47b99ac1f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 685c549..c70d7d6 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 685c549bb39a1c1d538a1b8856ead0386f4aa08d
+Subproject commit c70d7d627a9c59a4d10f6c6a3c2b4ccb45365e4f