Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "Add test area 'filtering packets based on security rules and port security'"
  - Add test area 'filtering packets based on security rules and port security'

    JIRA: DOVETAIL-473

    According to Dovetail addendum doc, add one test area about basic cloud
    capability 'filtering packets based on security rules and port security
    in data path'.

    Add the test specification about this test area.

    Change-Id: I814204f16b79bc06d9bfb54d5a90692d8b8c7bfa
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index f765ac9..6d3d7ae 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit f765ac994005056a94212cbcb43db51c614443f8
+Subproject commit 6d3d7ae7fad884a37e01c275511fa15e97dcd665