Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Bugfix: delete extra whitespace

    Change-Id: I1fe8c9d4b6b2ee461320bc20342d439e23c9c616
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1d30039..30eb16f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1d30039496ef46a42c8d993260338c062c547a1a
+Subproject commit 30eb16fb6d7f16bc05258298eeef78732bdd9cf0