Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 29bf5ff331ebb6f59f15d87027fd0d52a456018e
  - Replace slave by node

    Change-Id: I48fd9e340df09f5b5e66ef4e9a8cbd60cb4b3087
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7c28aca..29bf5ff 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7c28aca2263423c29ccaf01ea7180abd8758da92
+Subproject commit 29bf5ff331ebb6f59f15d87027fd0d52a456018e