Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Do not hide unit tests execution fail

    While moving tests from ./tests/ to ./yardstick/tests, both unit tests
    directories are executed. If the first test run fails, do not hide
    the error and exit immediately.

    Change-Id: Ib6c64ccf2f4b19722722eb43b3d45d5ad5f0169d
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index d579e62..9059d8d 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit d579e62b431a31856a03098dc5323948ccfa4fdb
+Subproject commit 9059d8d7170a834e5048ac08a375bfceca52ed71