Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 1478e5094c7d0d98445d76cfbf3bbdaaa0484ec5
  - Add more debugs in gsutils (cntt)

    Change-Id: Id37a6860628d669876bbe246eacebd702e5b0c6f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index f5188d2..1478e50 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit f5188d2b12f11ddb3ea92823038d4b715a6e8306
+Subproject commit 1478e5094c7d0d98445d76cfbf3bbdaaa0484ec5