Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Create an initial file for return value

    Change-Id: I7c19dbe853124272bbf7203ab2778b616c847048
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 6f6cf24..09d0a1f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 6f6cf24f53add8df9cd976da3ba211ab564814fd
+Subproject commit 09d0a1f22abe00a9708237b710718830e1e84f4e