Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove the useless opnfv_tests dir in tests"
  - Remove the useless opnfv_tests dir in tests

    Change-Id: I41a8db181adf6c0c67b9de8380c3ccdd1ad3b529
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index a1a5823..9d4e6cb 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit a1a5823613824eedac0672b1b64cec06b9068e6b
+Subproject commit 9d4e6cb10fef5f0cef104861034340cda5e48a3e