Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - [cvp-web] Bugfix:return 500 when upload a tarball file with no results.json

    JIRA: DOVETAIL-558

    The Web portal will return 500 code when upload a tarball file with no results.json
    When all test cases failed or report with wrong DB url, there may be no results.json.
    Check this and alert users instead of returning 500 status code.

    Change-Id: Ie13d9c3c62044c525f5dbb3fca9b6123d0b5acce
    Signed-off-by: grakiss <grakiss.wanglei@huawei.com>