Update git submodules

* Update docs/submodules/releng from branch 'master'
  to eb72439885a4614c83213dc4b15fc7d629d29aba
  - Remove Apex jobs

    Apex dropped a few years ago and false dependencies between Apex and
    Functest jobs forbid Functest maintainance.

    Change-Id: Ic63995325a281e0308abc28e9a89e8054c123391
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index e6f9bf8..eb72439 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit e6f9bf8d6400b4709ff52a9ea8a23a44b292bdd0
+Subproject commit eb72439885a4614c83213dc4b15fc7d629d29aba