Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 4325db541cfdb83ebec3bc3551fa7f6084d5e647
  - Fix chicken&egg

    Change-Id: I3c7f913d30630ce482ac90bdf2f14277970ffb40
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
  - Revert to fix chicken&egg

    Change-Id: I0a406781bbbdafa04db8d50add95a73821491c48
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 849155c..4325db5 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 849155ca2c480e87a89106c44f7a94a2331594ae
+Subproject commit 4325db541cfdb83ebec3bc3551fa7f6084d5e647