Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 4bed87d64065c1ed04a4a56109ddd1161e180868
  - Merge "Clean obsolete barometer jobs"
  - Clean obsolete barometer jobs

    It removes all branches older than Nile.

    Change-Id: I6872bf24c94cc3e00f09a918c310b4e78c54c14d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1b8c086..4bed87d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1b8c0861b7906f65dffdb42d39a91ea59a5f751b
+Subproject commit 4bed87d64065c1ed04a4a56109ddd1161e180868