Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Change scenario name"
  - Change scenario name

    change the scenario name nosdn-dpdk to nosdn-ovs_dpdk

    Change-Id: I28ac023b19a07c6d8e9ba9d202d73773442576c5
    Signed-off-by: wutianwei <wutianwei1@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c8ba060..fb88e7f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c8ba060756ea33769b536d6ecef74a53c96db8fb
+Subproject commit fb88e7f0213e138b9214a3e24dbecec73057acef