Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Checking if hacked quagga bridge exsists and contiune

    Change-Id: I8983ed687dabba0af2128c0ce06bd53aba22c819
    Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 9a52d17..2bfbe25 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 9a52d17d9ac79c358647d87b5d540e869b25769d
+Subproject commit 2bfbe25b1df24d562789faa641c41e9cafec7efa