Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Update Rally to 0.10

    It requires to sync os-faults with OpenStack requirements as it's
    out-of-tree too. The last os-faults version is selected as well.

    Change-Id: I0c582070a937b6ba6cba5b0c17673f42ea5d6dec
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 945b441..ff34df7 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 945b4412574d87a1ed700e59fa8ffeea92dc9e0d
+Subproject commit ff34df7ec7be6cd5fcf0f7557b393bd5d6266047