Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Run unit tests as travis-ci job

    tox doesn't run perm and py35:
      - travis-ci doesn't set the classical umask
      - ubuntu 14.04 doesn't provide any python 3.5 package

    Change-Id: I72ba109b183f079a833a4bab4ab4853d4870ce49
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ab24f04..c254799 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ab24f04ce0a27686e5f0c3f465ccb0ff06c48dfe
+Subproject commit c2547994a6b7dc0839f595f72a4f874a006a4638