Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: more snapshot fixes

    Changes-Include:
     - Rename jobs to have 'os' in them to distinguish openstack branch
     - Fix uploading snapshots to upload from the create directory (where
       the artifacts are built and stored)
     - Fix the properties file so that it is created if one does not exist
       already upstream in the artifacts repo

    Change-Id: I0d75fd41585538cbe860274a082cb4051d8b05c5
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4c34259..3dd6259 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4c34259866bd34d79fb5a100b8355404d9eca36a
+Subproject commit 3dd625926e04a3791acd006f83be17dc3fd8979e