Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Use StringIO in odl.py"
  - Use StringIO in odl.py

    It avoids creating and removing the temporary file to dump robot output.

    Change-Id: Ia5ea66e76ffb8b8327f2da938f177e8ef4c61dd4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index a250692..5a36bcd 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit a2506925351537ef8cdbf8c161fc9c13df098c90
+Subproject commit 5a36bcdef5ce8840322cbdfca6b4f93f7e12967e