Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Adapt SDNVPN Functest test according to new framework

    - Inherit from TestCase class in Functest
    - Remove any push to DB method, since Functest
       takes care of it

    After this change, we will be able to load this module
    from Functest and make a python call instead of
    a bash call.

    Change-Id: I80bdb7eaac3a2d1f48e32bafa381a42cadb36138
    Signed-off-by: jose.lausuch <jose.lausuch@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index fbbc9af..56107fb 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit fbbc9af8629f7521561ef16ed13484175ec2d723
+Subproject commit 56107fbfd2c991cc00d999fb3b081c979f56db86