Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Kubernetes context adoption when run in CI"
  - Kubernetes context adoption when run in CI

    JIRA: YARDSTICK-801

    We need kubernetes test case run in CI.
    We have one scenario k8-nosdb-lb-noha for kubernetes.
    But for now, we need to do some adoption in CI script.

    Also I move check OS_AUTH_URL in heat.py.

    Change-Id: Iff86caf77fd74e70469ad2dc43f2238097ce0001
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 6b762e9..57b17a2 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 6b762e9edb2f7913348d99c1c240fe94b9f7cbf9
+Subproject commit 57b17a2223d8751f2c5eae660b706e2fc736a47c