Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Decoupling Functest Docker config items from source code

    There are some special Docker setting item when creating Functest Containers.
    1. Remove the extra settings which are required by Functest Danube.
    2. Remove the settings for pushing results to DB because
       Dovetail plans to disable this function.
    3. Move the other special Functest settings to config files.

    JIRA: DOVETAIL-639

    Change-Id: Ibc4090b5c0aafdf9ed64e65a9a92e34a12a16df5
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 698cd3f..8b13de4 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 698cd3f4246c4e472c306fcad57d8d7b6431333f
+Subproject commit 8b13de4224400f8c2d1f4eb12aedb122c24cf86f