Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Update unit test related to vyos_vrouter"
  - Update unit test related to vyos_vrouter

    Utilvnf is now mocked to stop triggering the git clone of an
    external repo and creating dirs.
    Else we may get errors when testing offline.

    Co-Authored-By: Cédric Ollivier <cedric.ollivier@orange.com>
    Change-Id: Ia7e86593ecca9b9add747ef89b1d5e8d6bdb2d7c
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 10ff40b..6f56dae 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 10ff40bdfe462d4c6e77f48683d10b4f52b152e0
+Subproject commit 6f56dae69bd4ec71b9e09869f167c389c7939c8c