Update git submodules

* Update docs/submodules/releng from branch 'master'
  - separate db methods from handler.py

    db methods are mingled in handler, which is not well structured

    Change-Id: I639679d3fc05a0b6528158186b8bf89e0cd10596
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cbcabf6..822cd5c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cbcabf6643e68c019b407c95b1526e77337f7697
+Subproject commit 822cd5c32c9a129aa8aad9952f25a37123c96733