Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 28a3ae9fd59a1a9ad875280f440a73987480a0d9
  - Merge "Increase timout for apt locks"
  - Increase timout for apt locks

    Change-Id: I9d810e05d70cedb7e983322eb63958bd60885e6a
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5bd0359..28a3ae9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5bd0359742f4850a9599986f7fb2faa304d21e58
+Subproject commit 28a3ae9fd59a1a9ad875280f440a73987480a0d9