Update git submodules

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

    Change-Id: I7cb738d1f351df557846270bb176870bc9d11d92
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 76cca18..24b6e10 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 76cca182b5d17340e747d1482d4961471f6dfafd
+Subproject commit 24b6e10c5a67814a39a492914ec77fb10f4b52e3