Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Decoupling Yardstick Docker config items from source code

    There are some special Docker setting items when creating
    Yardstick Docker Containers.
    1. Remove the extra settings which are required by Yardstick Danube.
    2. Remove the settings for pushing results to DB because Dovetail
       plan to disable this function.
    3. Move the other special Functest settings to config files.

    JIRA: DOVETAIL-640

    Change-Id: Ic2d90393e227d7886b14d805eaa307b7aef56e4a
    Signed-off-by: xudan <xudan16@huawei.com>