Update git submodules

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)