Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Delete the invalid url which causes jenkins-ci failed

    For Functest, it uses Shade instead of openstack python client.
    Remove the link of openstack python client and replace with shade.

    Change-Id: I5660ecdc243468a1da7854cde3a98ce424dbffe4
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 3f842d1..dcd1697 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 3f842d1ae584959ec9a28c3a4bb6a9161af0fc49
+Subproject commit dcd16973180f55be907c79f074040b498c3088b9