Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Optimize fetch"
  - Optimize fetch

    depth 1 is set when fetching.

    Change-Id: I1b470d1e370e18de9b3cfa51e5aea0374f76cac6
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index cdeeacd..57bd36e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit cdeeacd093740b87865dfbffb92c6c6d5b917d3b
+Subproject commit 57bd36e426ef797cbc66f4031d612701671f7252