Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Stop hardcoding Docker repository"
  - Stop hardcoding Docker repository

    Change-Id: I7c8a131b4f80b58ee136e63c547c4fe55822a134
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2fbdbed..2a32f9c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2fbdbedbb88ddd1cd126034811a4d1a5120a15f4
+Subproject commit 2a32f9cd7a843c6af8486f49a9d5833e5b6726c2