Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 350a7f30d3f7ab3021ab0c47f272e1d3adca741c
  - Well cleant all before starting the distrib containers

    Change-Id: I3dd383f1c60484b203e583669c869f2119c4486f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index deaa061..350a7f3 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit deaa06131dd972fdb45dc310925f2680bd8f21bd
+Subproject commit 350a7f30d3f7ab3021ab0c47f272e1d3adca741c