Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "change the timeout to 4 hours"
  - change the timeout to 4 hours

    it need to download the tar.gz and We install the packages inline.
    Due to the network, sometimes it will cost more time.
    150 minutes still is not enough.

    Change-Id: I28ff7840dc3d705c4d0a32cde718230d92b6ea19
    Signed-off-by: wutianwei <wutianwei1@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b9492a0..d6ddd64 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b9492a0eaac9838fdfb6b070bcec328387881129
+Subproject commit d6ddd640b1053d473f69a6915e137bacd174e08b