Update git submodules

* Update docs/submodules/releng from branch 'master'
  to aac2f29f5839faa1e235011c4ee9011e83912eb0
  - Merge "Fix testing slave"
  - Fix testing slave

    Change-Id: I6e0b751776929e2ec1f44afac5407f514af89177
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index da1bdaa..aac2f29 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit da1bdaa62d2b52611e5a8f7d5cff98bebf078e06
+Subproject commit aac2f29f5839faa1e235011c4ee9011e83912eb0