Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Suggest to pull manifests instead of arch tags"
  - Suggest to pull manifests instead of arch tags

    Change-Id: I17d45782feb38946f9524859354f24d392b56f25
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 0eaf501..e57c5fa 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 0eaf50150fccd1acd1e8d8c2bbd8ef0a1e1afc3f
+Subproject commit e57c5fa1fb21ecd8cde0947673e9c410a2d5fdd6