Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Add unit tests for sdnvpn

    Change-Id: Ie4ebc4e2bc6f2e66f5f567f45f44c073cd9d313d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index f335f00..48fc7ca 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit f335f0032b9eb0847de4fd1261f063012bc4d2f5
+Subproject commit 48fc7cad7eb4cec0b928aba3daca7e934d46d87c