Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - Bugfix: Add opnfv_os-odl_l2-moon-ha_daily testsuite for Compass4nfv

    Change-Id: I46c6b56e1293c3d594804d77a73c391922f03653
    Signed-off-by: JingLu5 <lvjing5@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index c69a715..85c119b 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit c69a7153e498fb2cb6510d728d060f1f123e8dbd
+Subproject commit 85c119beb49b545bcfa6bfbf1d25faff5648fa8c