Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[container4nfv] Create stable/fraser branch"
  - [container4nfv] Create stable/fraser branch

    Fix the location to be the git commit and not Gerrit change-id.

    Change-Id: Idd02beb4881a66accd55299e879799b2ec6626a0
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a0e580f..320f1f1 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a0e580fc58b41532937496267396de2b98994d85
+Subproject commit 320f1f1f156c0609dc6f0f7f8195e9768d9d37c7