Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 8657f6441611c7dd94067c21813761ab9c3a9475
  - Add dovetail Hunter for rtd

    Signed-off-by: xudan <xudan16@huawei.com>
    Change-Id: Idaecde169e6a30847d15e6489b39dadaa0b6d90a

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 961fc01..8657f64 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 961fc01f1c2293982ae9f0921963a4ac77b7a66d
+Subproject commit 8657f6441611c7dd94067c21813761ab9c3a9475