Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "Don't generate tar file when run without pushing results to DB"
  - Don't generate tar file when run without pushing results to DB

    1. Dovetail generate a tar file for uploading results to CVP web portal.
    2. If users don't run with option --report, it shouldn't generate the tar file.
       Because users can not upload results to CVP if they don't run with --report.
    3. If it generates the tar file when user run dovetail without --report,
       the tar file is invalid because it lacks of results.json.

    JIRA: DOVETAIL-511

    Change-Id: I4d21f21f0b278962564d810369df03100b38f003
    Signed-off-by: xudan <xudan16@huawei.com>