Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "bugfix: fix HA testcases"
  - bugfix: fix HA testcases

    Change-Id: Ib38e94610a108ff7195cefdfaf048e0f4fd894e8
    Signed-off-by: JingLu5 <lvjing5@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 0cca445..284c0a3 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 0cca44508c3a171cb5e94347a3b555462ec31cd3
+Subproject commit 284c0a3e13aa1c3cc83bac3d4c9d6b69fc479b79