Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Add ability to reuse existing OpenStack set-up"
  - Add ability to reuse existing OpenStack set-up

    This change adds two optional flags to the context configuration for heat:
    * no_setup -- to re-use an existing OpenStack deployment
    * no_teardown -- to skip undeploying the context, so it is available in other testcases

    In order to achieve this, resource naming had to be made more predictable.
    When no_setup or no_teardown are set:
    * Do not add a suffix to context name
    * When searching, try with and without a suffix to find a server by name

    All behaviors remain the same unless these values are set.

    NOTE:
      This feature doesn't work with the NSPerf scenario, because the
      interfaces in the VNFs are bound to DPDK after the first test, so the
      look-up for missing topology information fails in subsequent test
      runs, as the interfaces are not visable to the kernel.
      This can be addressed either by either unbinding the interfaces from
      DPDK at the end of each test, or modifying the look-up for the missing
      topology information to query DPDK as well.
      The change will be made in a future patch.

    JIRA: YARDSTICK-886
    Change-Id: I6df5e86e419c283a2bee41917e4f62179aa9c31a
    Signed-off-by: Emma Foley <emma.l.foley@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 6f7dd8f..3536e57 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 6f7dd8ff0e6358ef958426a6baeae5deee1a57d8
+Subproject commit 3536e57cbbe7e84461d50a87fb87b4e99b4cd20a