Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Merge "fix for sdnvpn CI test failure"
  - fix for sdnvpn CI test failure

    Change-Id: Ie55ccbe68f57a9bb03efc8b6eebf23a0018a0bca
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index cf8727b..b7a8df9 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit cf8727bcaa2b82c5f1d370bb41f62cd7ed8df571
+Subproject commit b7a8df9145600fbd12658ac829c813bd20455b95