Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge "Bugfix: HA test case baremetal down ipmi power off failed - dovetail" into stable/fraser
  - Bugfix: HA test case baremetal down ipmi power off failed - dovetail

    Test case tc025 baremetal down failed to ipmi power off the node.
    This patch target to solve:
        ipmi_password is not correctly fetched

    JIRA: YARDSTICK-1326

    Change-Id: Ia915cd07cba420643fa9a679975178328be55700
    Signed-off-by: rexlee8776 <limingjiang@huawei.com>
    (cherry picked from commit fb895253e4ceeff2df53043b5b994f63c740b1f6)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index dc632d5..3dbd1f3 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit dc632d55552c63985b0dd2b0f007bc6afb9920b7
+Subproject commit 3dbd1f37f5250978ada4e7a0766a949985609e6a