Update git submodules

* Update docs/submodules/releng from branch 'master'
  - [daisy] delete tmp dir with sudo

    Permission denied occured in [1].

    [1]: https://build.opnfv.org/ci/job/daisy-deploy-zte-pod9-daily-master/7/console

    Change-Id: Ic7e67eed8a121cae0ea2c05ab4cc9005358fcda5
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 887c61b..b962472 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 887c61bb5e98d2e527d966d1a2efe10e293d3407
+Subproject commit b9624720da72b53d0c29acf4aabc9b81a6c1e5de