Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/fraser'
  - Updated scenario documentation

    Change-Id: I125988afe557e5117fcbbace23b5e48e740d216c
    Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>
    (cherry picked from commit b1c8323dcd962b456da0438df65b4a37bb12f3d7)

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index d56cc98..be6cce3 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit d56cc9831e64559cf97071fd8d8a4798bd3a2346
+Subproject commit be6cce375c0363f93fa6b1a099eb34fee75a6161