Update git submodules

* Update docs/submodules/yardstick from branch 'stable/danube'
  - 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>
    (cherry picked from commit 27cc0643cf93f4b44c12fbdfcc3e0841d46214c4)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index e658af7..77d3868 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit e658af791d52b4999e8a0164f89f0c079e2d4896
+Subproject commit 77d38685b12e968147432649d0546eeb97319e39