Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Fix version in setup.cfg

    It cannot be installed due the new branch.

    Change-Id: I1898190cbf522dbfbaeaa89e3d65a7b2e27fb2cc
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 303268d..785cd7b 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 303268d0464127c52f11443404fb1baae03d615f
+Subproject commit 785cd7b2bfd56a0f157898335a27ecf4ca9de782