Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Raise Exception if HA test case failed"
  - Raise Exception if HA test case failed

    Change-Id: Ia3677724075c1c1408f50bbfcebd3cbcde251d66
    Signed-off-by: JingLu5 <lvjing5@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 718610b..4db701f 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 718610b927218906583b474019b3834def8637de
+Subproject commit 4db701fdc4da663b0b61d9930777a2201b315f8f