Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Updated from global requirements

    Change-Id: I094aa8c5cc901c4b5f083651a8224d64324dfc44
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index fc149c8..fdabb0a 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit fc149c80771705b894d7a1dac427ce112c3c48b6
+Subproject commit fdabb0a5e92200c09e1476be01bf4353b0823e63