Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fix last Pylint error in Functest"
  - Fix last Pylint error in Functest

    It also fixes all pylint warnings in router and the related unit
    tests. tox.ini is updated to ensure that no error is introduced.

    Change-Id: Iddd74b0dac7b6581d72b04369140006c9e19f998
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 5a77070..3a042e0 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 5a77070ed767158017ceb8ea3c319af60c86b830
+Subproject commit 3a042e00c533dae47014842ed345da6b321f5eb9