Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Rename logger to __logger in unit.py

    This mangling ensures that all info messages printed from core packages.

    Change-Id: I77ac1c80360d45ef19ed7c3fa05a894804c92216
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 34b2583..475090f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 34b2583ee5509daf8b237a9c55173026ad42b2bc
+Subproject commit 475090f0d7a679b8c223a225c16eb858cbc7d82d