Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Revert "Temporarily redirect to /dev/stdout in functest-alpine.sh"

    This reverts commit 24b6e10c5a67814a39a492914ec77fb10f4b52e3.

    Change-Id: I7631dff6f57d8580158aac3090f2ed415d4f27ea
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1ca9bc9..3dec90d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1ca9bc96cb5f566e9db385058b2b4e3b399c27d3
+Subproject commit 3dec90dac96dd70b7ab465fdf894a50f10f7c99c