Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Bugfix: kubernetes context do not implement _get_network"
  - Bugfix: kubernetes context do not implement _get_network

    Since kubernetes context do not implement _get_network,
    so when run unit test case, we will get a error:

        TypeError: Can't instantiate abstract class KubernetesContext with
        abstract methods _get_network

    Change-Id: Ib56abe7c580ef8a6fc9f52f3fcd566d0fa70e1cc
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 8d85e42..eeda3f6 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 8d85e42443d8ebea23c90d82ae649716ecc713cb
+Subproject commit eeda3f6b215c16cbb567168cb63d987c65f8a1b9