Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge "Replace cinder create volume with shade client." into stable/fraser
  - Replace cinder create volume with shade client.

    Adds get_volume function.
    Function create volume now uses shade client.

    JIRA: YARDSTICK-891

    Change-Id: I0b2fae5f2cf52eaf2e4a0062c858d49bc4ce9ccd
    Signed-off-by: Shobhi Jain <shobhi.jain@intel.com>
    (cherry picked from commit 2d33d0f289f3dd3864fe57289e953b876f362c06)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 07107af..dd13dca 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 07107afe36c49a43f21c29899a5084e42392864f
+Subproject commit dd13dca9aedeeda181e33f9ca8c56e4a465fa806