Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - add opnfv_os-odl-fdio_dvr-noha testsutie for Apex

    Change-Id: Idd60153e6097cbef6513942653429d2ec96a8c17
    Signed-off-by: JingLu5 <lvjing5@huawei.com>
    (cherry picked from commit b122091bcc2e780be3694cf0faa1b771994798f6)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 75a6f23..f34a98d 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 75a6f234f3ea392c2a22f7a698b92eb006ec4faf
+Subproject commit f34a98d4126f6736571ee2881e4a8cffa4975b5e