Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - Create test suite opnfv_os-nosdn-openbaton-ha_daily

    JIRA: YARDSTICK-823

    We need to create test sutie opnfv_os-nosdn-openbaton-ha_daily.yaml
    to enable this scenario.

    Change-Id: Ia800a9c74aaecf0d73e6f0fd559630b741ad2432
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>
    (cherry picked from commit 164d60cedff53c520e4c36a37cb1a02bf873f7fb)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 82d674d..c4d56b0 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 82d674d803db7e880fe413c115444640836ae5e7
+Subproject commit c4d56b024c9b8ae5c39572a5ffb3e867eec098db