Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Bumped ansible version to 2.2.2.

    Change-Id: Ibdf633bd475cc295f53e8236b1938a3354cb4f99
    Signed-off-by: Maciej Skrocki <maciej.skrocki@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 5271e61..9611dcd 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 5271e612d427b29c2da84f8417f4192427ae3977
+Subproject commit 9611dcddab0202f335b5f778629053da7b96fd0e