Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'stable/danube'
  - Merge "Bugfix:HA test cases rely on dynamic ip addresses in fuel pods" into stable/danube
  - Bugfix:HA test cases rely on dynamic ip addresses in fuel pods

    JIRA: YARDSTICK-602

    change HA test cases to rely on dynamical generated pod.yaml in fuel pods

    Change-Id: I0efb01489eb2dd94babf1a45bff2fbf6adef5f6e
    Signed-off-by: JingLu5 <lvjing5@huawei.com>
    (cherry picked from commit 6c414e6f46861f71aa68db43ffabcad2305f3f32)