Update git submodules

* Update docs/submodules/releng from branch 'master'
  to e4b1426a741a65834b2374c331d5a4257816bfdb
  - Call docker via sudo

    Switching slaves from Alpine containers to Ubuntu hosts requires sudo

    Change-Id: I4fa45ab4af43d2bcebd8501977cb971f443efcab
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0766872..e4b1426 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0766872ba98dc6c46bbe2cfac085bb090b279489
+Subproject commit e4b1426a741a65834b2374c331d5a4257816bfdb