Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "simplify unit tests implementation of update scenario"
  - simplify unit tests implementation of update scenario

    1. delete useless input arguments
    2. update on and assert with self.req_d directly
       delete intermediate variable 'scenario'

    Change-Id: I3eda1df4893c890bb23ccf05b45ce2de5fa9dd93
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0889958..a45e3e9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0889958d6eaa4eff43df7fd4b7c34f16de41fc0b
+Subproject commit a45e3e956f9a23ec963318f56575974e1a755c93