Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Switch to Docker post_checkout hooks"
  - Switch to Docker post_checkout hooks

    Automated builds work when Dockerfile is modified after checkout.
    Otherwise they are not triggered [1].

    [1] https://github.com/docker/hub-feedback/issues/518

    Change-Id: I6ba9e06f9e62011d2f1c1788f2647b1175842ef3
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 7a9a5e6..cafd4b4 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 7a9a5e6c6eaa9f38eb455f4822934c60c7bc8fb5
+Subproject commit cafd4b4d34bdebd8158c1b4c7b9dee272b570bb2