Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Bugfix: tar results dir cannot be parsed by web portal

    The directory tree of results tar file is wrong, so web portal cannot parse it.
    Reset the tar file.

    JIRA: DOVETAIL-508

    Change-Id: I8475323294e84ca51242b700570926d5c0177390
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 6f47c82..3fecd53 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 6f47c82d4b6f830863ff1330163d869baa6c7eec
+Subproject commit 3fecd537f9c65a55512abc73e2ee301e1571b281