Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Delete functest_vacation.py

    Change-Id: Id0e2769a1989e6778ae41f67ed634e2e5002a83d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 4577924..c653ed7 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 4577924d883f56c4fe13a60d1d8533b798375aad
+Subproject commit c653ed78d7721b9933e08015e45dd39379aa4316