Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "dovetail tool: set a unique build_tag for each DoveTail test"
  - dovetail tool: set a unique build_tag for each DoveTail test

    JIRA: DOVETAIL-379

    1. create a uuid for each test, and set build_tag=daily-master-<uuid>
    2. the reason it starts with "daily_master" is that it's the requirement of
       functest when push data to DB.

    Change-Id: I9a59d5695a9f0d83bf4330379f1949a2a04f876c
    Signed-off-by: xudan <xudan16@huawei.com>