Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: Removes branch from functest scenario

    Branch is messing up functest detection of deploy scenarios. Therefore
    this patch removes the branch from the scenario before passing it to the
    test job.

    Change-Id: I1b59125941e839f1937cba565c73e39efb460573
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4191a7f..6cb78ad 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4191a7f162fb41f7933fb0a205c5a33d66ad8e21
+Subproject commit 6cb78ad8bc1af9e14fac0d3255af0f31e885657f