Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Mute log in vnfs

    It also configures the nameserver when creating the subnet in
    juju_epc.

    Change-Id: I163ba99cd56f44ca3c3464398e182152b3ab74dd
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 8de16b7..2b6950c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 8de16b7187a8a6133c025ef504ead48d7adb0cac
+Subproject commit 2b6950c3d496b42ef62632c638a27d79d73e3364