Update git submodules

* Update docs/submodules/releng from branch 'master'
  to f394ccf876df2f3b8b9fe452bc9a7b28fcade1f1
  - Fix download campaign builder

    Change-Id: If45d1f95030f773acda45d65af5caf2b21dc991d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 64617bf..f394ccf 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 64617bf4c8c954defeb63d737c25531a0c9e127b
+Subproject commit f394ccf876df2f3b8b9fe452bc9a7b28fcade1f1