Update git submodules
* Update docs/submodules/dovetail from branch 'master'
- dovetail tool: show progress during executing test cases
JIRA: DOVETAIL-159
1. It takes long time to execute test cases that most of users think it hangs there,
so a progress is needed to show the test is running.
2. add dynamic progress during execution
3. it' s a fake progress only showing the test is alive,
not to show the percentage of completion.
Change-Id: I0294659f79e8e09d1bcdd36d8f391d933e35b635
Signed-off-by: xudan <xudan16@huawei.com>