Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 4e4ed760ca02f76f32f7a2dc648cc01dbcf58ec9
  - Set the commit ID of the actual stable version of Moon

    Change-Id: I9eeff4bed9d8eb44e4d1db3106ade70d383e54fd
    Signed-off-by: Thomas Duval <thomas.duval@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 728e83f..4e4ed76 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 728e83fb0fb150036bd67e6ca4a33ba1fee20a22
+Subproject commit 4e4ed760ca02f76f32f7a2dc648cc01dbcf58ec9