Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Logger must be a singleton

    It avoids creating a python object for every message printed.

    Change-Id: Ia42b59db9f7ce4eadc7e91da4d193db646b54d85
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 801ac1c..0acb8eb 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 801ac1c76853419136324b883d95021d810ab4d1
+Subproject commit 0acb8eb018afd993c363c05da8a45091abc59fd9