Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Tag dovetail with cvp.0.3.0

    JIRA: DOVETAIL-468

    1. docker image used
       yardstick: danube.3.1
       functest: cvp.0.2.0
       testapi: cvp.0.3.0
       dovetail: cvp.0.3.0
    2. main changes
       fix dovetail docker version to be 17.03.0-ce
       adapt yardstick danube.3.1
       For more information, refer to
       https://wiki.opnfv.org/display/dovetail/Running+history+for+the+dovetail+tool

    Change-Id: Ie8bb2cfbad4b416404f5aaa2c40c1d3832be676f
    Signed-off-by: xudan <xudan16@huawei.com>