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>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 002d7cb..ac766b0 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 002d7cb256e4f0753f4b738d7f3d2a7872704314
+Subproject commit ac766b065a8032e4aa90dafef2130292364a2483