Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Get install_rally.sh from git.openstack.org

    Change-Id: I99a87e2399c1be79dabc9109e10665fc9ef8bee2
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index b18c0e2..eef8a67 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit b18c0e21f34b1e80cb17aaae16b76b54d47c1f7c
+Subproject commit eef8a67c00db7a637c70d7ec3e2ee526ac74cd61