Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Dovetail should update testcases.yaml file

    It failed to run trunk_port test case because of the wrong class name.
    See CI results

    https://build.opnfv.org/ci/view/dovetail/job/dovetail-compass-baremetal-default-mandatory-fraser/7/artifact/results/tempest_logs/dovetail.tempest.neutron_trunk_ports.functest.log/*view*/

    Update the testcases.yaml file based on the latest version of Functest Fraser.

    JIRA: DOVETAIL-715

    Change-Id: Ib102d1489d1e5610a04d76aab0553d5171ec3d3e
    Signed-off-by: xudan <xudan16@huawei.com>