Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 876cd53e23632d587dc1229fa29ade3352ccae7c
  - Reorder jjb to allow us to only build containers

    It's required for the new Functest K8s tags.

    Change-Id: I5a924077e10bef703a946ea952d04c8fa0981329
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index f0aa868..876cd53 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit f0aa868797052e91262aeef09c6e5c97f263af49
+Subproject commit 876cd53e23632d587dc1229fa29ade3352ccae7c