Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Modify HA test cases and HA test script to support other installers"
  - Modify HA test cases and HA test script to support other installers

    JIRA: YARDSTICK-633

    Change-Id: I65fd1ba11504dc61485f83c3bcc93bec4d41883b
    Signed-off-by: tjuyinkanglin <14_ykl@tongji.edu.cn>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index a34afb3..c337eff 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit a34afb31bd142a798ba2c4b4ceb125cf74274dc8
+Subproject commit c337eff097139516b0bb2827bdb308e32416861e