Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Stop downloading openbaton image."
  - Stop downloading openbaton image.

    It's downloaded in all CI runs and forbids several ones (timeout).

    Change-Id: I2f269d941990b7235eba7cc6d58ad17072495176
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index d337aaa..3890608 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit d337aaa51d74314544c36ca30b6951cec1156d5d
+Subproject commit 38906080fd7c30a7f39ce9daa68d9150d63f80e3