Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Set Energy default values to None

    It conforms with the other default values.

    Change-Id: Id46110c5aedf244f94e83b5b0389b135f075ffc8
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ee83897..d0ffb7d 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ee838977750a9d23d02a710f7a41a02e8f0f24a4
+Subproject commit d0ffb7dd996ddd43a1e0fe78fb28ee88cb167fd6