Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Delete the right dir when building functest-vnf

    It reduces a lot the size of the docker image.

    Change-Id: Ifd577169697b33dfd89594e8dd3afe4aa34ec7f9
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index c391f57..2dcec69 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit c391f57e6797e544d14285ca433b2499ed84cd5f
+Subproject commit 2dcec69c4e9ed34d7046afa694e738c040be02e9