Update git submodules

* Update docs/submodules/yardstick from branch 'stable/danube'
  - Bugfix: change monitor command in tc019

    JIRA: YARDSTICK-655

    The original openstack command used for monitoring high availability openstack
    nova-api service in tc019 is "nova image-list", the "openstack image list" command
    used in tc019 now may not correctly show the nova-api service status.
    This is patch swtich the monitor command to "openstack server list".

    Change-Id: I8810f28b4328ceb4d911a3041a24774ae9cae8f0
    Signed-off-by: JingLu5 <lvjing5@huawei.com>
    (cherry picked from commit a5e13df9381c531716b1e41e7a9dedb130fc6e35)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 370632c..632dc80 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 370632cc02a711289f9830616d4ded2f6a9341be
+Subproject commit 632dc80c3ca42fe7f3d041c645eabef284f147e8