Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Bugfix: Error when create pod.yaml file if one node's role is None"
  - Bugfix: Error when create pod.yaml file if one node's role is None

    DOVETAIL-426

    Error message:
    if node.roles[0].lower() == "controller":
    IndexError: list index out of range

    Change-Id: I96d26cc3798b993b5b296f554becfc175e3e87b4
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b3e0ca2..9d074ac 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b3e0ca2af151693f8e6440c78af733700a6296de
+Subproject commit 9d074acbaabef39cade89da70f752e27f760a706