Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'stable/danube'
  - Merge "Bugfix: KeyError when using http dispatcher" into stable/danube
  - Bugfix: KeyError when using http dispatcher

    JIRA: YARDSTICK-632

    When we use http dispatcher to output yardstick result.
    It can upload data, but when we query the data, it get a KeyError.

    Change-Id: I5410c207c68cff2621ff8184ae17daa4c286cea5
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>
    (cherry picked from commit 1f59f2e6769cc7ae6f3b73eb1ce8ee09f2929f72)