Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "add more information for the Identity testcases in the refstack"
  - add more information for the Identity testcases in the refstack

    JIRA: DOVETAIL-431

    in order to show more details of the test cases,
    all below information are added:
    the Use case specification, Test preconditions, Basic test flow execution description,
     pass/fail criteria, and Post conditions

    Change-Id: Id1886be6a868813f2cff6cacf42329494e94308c
    Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>