Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Use dovetail cvp.0.6.0 to run Dovetail test"
  - Use dovetail cvp.0.6.0 to run Dovetail test

    Change-Id: I63e361eebe1345a34086ecbe99aba4504cb0f5bc
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 820d55d..641e492 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 820d55dd05fa39d7fe0d16ee9ab3f9046c10994c
+Subproject commit 641e4920bec46a77d8e3d3bfcd1dd4f9f9ac512f