Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge changes from topic 'stable-branch'

    * changes:
      Create Gambia and Hunter Release Jobs
      Create stable/hunter Branch for Functest repos

  - Create Gambia and Hunter Release Jobs

    This will create the release jobs needed for the OPNFV Gambia
    and Hunter stable-stream release process.

    Change-Id: Icdb9a337dcbad26fccb0e1e2935f8082f17bb220
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>
  - Create stable/hunter Branch for Functest repos

    Change-Id: I99d60abfad4b90988d3188378fec84556be430e0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 183e34c..c20919f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 183e34c6790183dcae39fb1be7064eef74c3d03e
+Subproject commit c20919f1f430cfbad1238a6d74b9c782f696732d