Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Bugfix: HA kill process recovery has a conflict"
  - Bugfix: HA kill process recovery has a conflict

    It happens in Nokia SUT when running in the Plugfest. The problem happens when
    the start_process start to recover the killed process (like nova-api), but the
    self-cured mechanism already recovered. And somehow it lead to a conflict and
    has problems.
    So the recover of the HA attack-recover should be improved to only recover it
    when it needs to.

    JIRA: YARDSTICK-1222

    Change-Id: I1acb5a7d59d6fe4e0de0b0c5942fa89e051dd1ff
    Signed-off-by: rexlee8776 <limingjiang@huawei.com>