Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/danube'
  - add lable for both scenarios

    Change-Id: I9b4cd79a40a6c0c0b057f5eb3cb2a4197f3264e7
    Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>
    (cherry picked from commit 352fe7c1a6206478f53b053e9f06ae57d6635c16)

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index d78cde7..bf201a5 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit d78cde76782fef27af8b26e81781e3c74158a5ce
+Subproject commit bf201a51b5d07bfd73d62070e09c6e7639001609