Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 40a430f39052b4b3fd167d610747a9406a2a7bd6
  - Deprecate ovn4nfv repo

    Requested as part of IT-20788

    Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
    Change-Id: I9598a4d3e9e98cf576ee3a4028336c3d53de3857

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0837527..40a430f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0837527fbcc32862bbdd22fc1b02f7848da3021f
+Subproject commit 40a430f39052b4b3fd167d610747a9406a2a7bd6