Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Reduce overview

    Change-Id: Ifb8915d62ea26f44f29c4d3b84beecd78dceae9e
    Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 0f8220d..c063e49 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 0f8220d5d96cc0a45be00e937c73ab938133e587
+Subproject commit c063e49cec6afa6ba1ab743a86482768fe1cc28e