Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 47fda3149de3d0abd9fca45e552cc67129e7d24c
  - Add buid_tag in Functest jobs

    It eases archiving all logs (third-party certification).

    Change-Id: Ief9c89ac9cf5a748fb8f6965078c9651fd0066ac
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a302007..47fda31 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a30200767b553b8fcbfff6077df937428be99338
+Subproject commit 47fda3149de3d0abd9fca45e552cc67129e7d24c