Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "delete obsolete run_test.sh"
  - delete obsolete run_test.sh

    after switching to tox, run_test.sh is not used now

    Change-Id: I66d40d6df47652b956f85f022843b60886ce41a2
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0c8fda1..4cea586 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0c8fda114b79ccf877a28d270f835317a9e847d6
+Subproject commit 4cea5862dfc7b44c902abef802de206db4a9c1b4