Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "dovetail: dovetail run against ZTE-pod1 od-odl_l2-nofeature-ha scenario"
  - dovetail: dovetail run against ZTE-pod1 od-odl_l2-nofeature-ha scenario

    JIRA: RELENG-277

    dovetail run against ZTE-pod1 od-odl_l2-nofeature-ha scenario
    weekly, every Sunday
    ZTE-pod1 od-odl_l2-nofeature-ha scenario already exists, see the time trigger "0 2 * * *"
    dovetail-fuel zte-pod1 job already exists

    Change-Id: Ic870a78623873ce2f717477dcb09f18794651899
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 05591ef..6696c43 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 05591ef9c26a988192941ea5986476723391215e
+Subproject commit 6696c4368b31a4ed033a13365e3d9f73845a5ab1