Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "Add test case tempest_custom into the local database"
  - Add test case tempest_custom into the local database

    JIRA: DOVETAIL-429

    Test case tempst_custom is not in the initial local database. Add this test case
    into local database.

    Change-Id: I53d3f6ebdde7ff680e33faf8296551d81f3c0496
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 84e7b3b..bd5ff3b 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 84e7b3b030018fd3f464bfa9c47c1df9d07ce675
+Subproject commit bd5ff3bd10fffd84e79dad47be4d6fb7eea66d26