Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Add common openstack opertation scenarios: volume & floating ip"
  - Add common openstack opertation scenarios: volume & floating ip

    JIRA: YARDSTICK-781

    This patch adds some common openstack opertation scenarios

    Change-Id: I1300a61b389202242f112b6d280ab47746379546
    Signed-off-by: JingLu5 <lvjing5@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index faf7ef0..5ed1f7e 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit faf7ef045dbb08d00e0a19374c6075d85ff5ad60
+Subproject commit 5ed1f7ebbe7a9ae6138f56051a15e7774f6e71b9