Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Bugfix: ansible can't not run without config"
  - Bugfix: ansible can't not run without config

    JIRA: YARDSTICK-1135

    Ansible need ansible.cfg when run in the remote node.
    However the file name is wrong. Need:
    setup.cfg -> ansible.cfg

    Change-Id: Ifa674fb624ca83d90c3ac9ad3bfe148013bf8bfd
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index fc7f814..2ea488b 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit fc7f81481982966ab9260534d815cfda272b8d44
+Subproject commit 2ea488b1df9eee441b41e81f1fbdb10dfb3817b0