Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "add defcore/ha testcases to proposed_tests"
  - add defcore/ha testcases to proposed_tests

    JIRA: DOVETAIL-398
    JIRA: DOVETAIL-399

    1. this testsuite will run in community CI, see
    https://gerrit.opnfv.org/gerrit/#/c/33509/
    2. HA testcases please see
    https://wiki.opnfv.org/pages/viewpage.action?pageId=8684344
    3. vimops testcases deleted, since it's covered in defcore

    Change-Id: Ied9c8867e0aa99e33fd213030e6471aa5cfb86e8
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>