Update git submodules

* Update docs/submodules/releng from branch 'master'
  - [daisy] Enable ovs_dpdk scenarios jobs

    Change-Id: I5193285493926fcf82779f12d491a118bc83baa7
    Signed-off-by: 00184532 <lu.yao135@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cdac715..2ad4217 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cdac715adadb6b1b0662aac2aaedbcb33d223258
+Subproject commit 2ad42172afe06e06a32d6fa1c24e6106e5997eaf