Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/euphrates'
  - SDNVPN-184: resources are not cleaned if tc fails

    * moved the cleanup code inside the finally block in each test case

    Change-Id: Ifc0fee58451923117c54040c716dad6827fbc7fa
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>
    (cherry picked from commit 6c878a213164dc895841046170869a50e41c9e7a)

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 963ad96..13cb940 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 963ad969487d9896f126afadc8222c48460b81b2
+Subproject commit 13cb94010d4c40f4472c1bcbc7e2462ba9f8838b