Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "Bugfix: pre_condition cmds is just executed once"
  - Bugfix: pre_condition cmds is just executed once

    JIRA: DOVETAIL-489

    1. All the cmds defined in pre_condition is just executed once for each type
       i.e. functest, yardstick, bottlenecks...
    2. The copy cmds defined in each functest test cases are just executed for the
       first test case rather than all test cases.
    3. Make the cmds to be executed for each test case.

    Change-Id: I571f0eb9dd3cab77fc8597e5a9b5246398804d3e
    Signed-off-by: xudan <xudan16@huawei.com>