Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Remove dns server from juju_epc config

    The dns server shoud be set by the Cloud provider via Neutron configs.
    Snaps is currently enforcing 8.8.8.8 as default too.

    Change-Id: I3e9a25d8bbfbab4cd1d44e394235b329df86e82e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index f48ff10..3edd080 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit f48ff105d10b4e25da8d24f2d20b7e59f06afaa4
+Subproject commit 3edd080dfe21c5a272ccf6d959c53d6e40fdadc7