Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add envs via volume mapping"
  - Add envs via volume mapping

    Change-Id: I39bdde31bfc5674eecf1528427b55a7f0335bd89
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cf55916..d53f5e2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cf55916d8c422b5f7f650270a60aeda1b3e78410
+Subproject commit d53f5e2ed32a1d61e74aa70cdca44f882d4b5e7f