Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add danube scenario "os-odl_l2-bgpvpn-ha" in fuel pod zte-pod1"
  - Add danube scenario "os-odl_l2-bgpvpn-ha" in fuel pod zte-pod1

    JIRA: DOVETAIL-500

    Change-Id: Iab4af16ecb31b183a375d03a9fc6066e00ecaec1
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 6ab401a..321d339 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 6ab401aaa8ce41526ae6c345ab0fa13f7713fff5
+Subproject commit 321d339d1aa81f65598755c33306e6eb23e1be95