Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Functest: removes redundant exit 0 from fetch creds

    Also allows unset and pipefail explicitly in set-functest-env.sh

    Change-Id: I06ae718f563fed0596a37cec1b3a78e44ee7ea5d
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 69160ba..efe68a7 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 69160baaeffd63bc5d1fd3eabf41e3879a8f817f
+Subproject commit efe68a7d2781f79b240a6f1bd3a1dd3798775df0