Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: fixes image dir for deploy with dev builds

    Change-Id: I59523b6233ca48c2eb2d4b4934263f0114d8e7a8
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9b95bfa..b72e97b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9b95bfa55fff9562dad699e1276f49e3549ad61d
+Subproject commit b72e97b1261f751dd1a3c15733e80923de57636b