Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Initial all url of api v2"
  - Initial all url of api v2

    JIRA: YARDSTICK-648

    Change-Id: I915889a974da9c49188c25fe2443ece481987ecb
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 80e57bf..fb86be5 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 80e57bf2264577cb08c2c347c7f0d272ee8d192f
+Subproject commit fb86be55d52f6cefd4e0de4b857ac76d00a9e681