Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 4748a7aa71da856310afd78e675a7d59db0111c0
  - Remove useless builds depending on arm pods

    No arm pods are up ad then they blocked everything for nothing.

    Change-Id: Ia866e1d7a72c7e84d83a820e14487e18e5474e58
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c285a88..4748a7a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c285a889f9121b27224cf53ae2cb4b6ed5b05493
+Subproject commit 4748a7aa71da856310afd78e675a7d59db0111c0