Update git submodules

* Update docs/submodules/releng from branch 'master'
  to cff01ea40159add3cf9d2e2299bd18d3b7a0bc12
  - Merge "Set verbose when removing /data"
  - Set verbose when removing /data

    Change-Id: I992a9c12fb5a1596b0972ddf9aebf86f33c562ef
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b3ef3c6..cff01ea 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b3ef3c63dd01b47a9c8ac4be1e6eddf18a9f8cfd
+Subproject commit cff01ea40159add3cf9d2e2299bd18d3b7a0bc12