Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 4f3ef44f1e06e0ccd1797283663096cdf4a62237
  - Leverage s3 as lf-build5 and 6 are down

    Change-Id: I18542f425dcbe585b1bb494bd89a66f7e7e962ee
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ccd6e37..4f3ef44 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ccd6e3781dee56ab6c58a19a1617f65564acfa8a
+Subproject commit 4f3ef44f1e06e0ccd1797283663096cdf4a62237