Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Take new amd_dirs into account

    It avoids falsy builds for RaspberryPI in Releng [1].

    [1] https://build.opnfv.org/ci/job/functest-core-docker-build-amd64-master/659/console

    Change-Id: I6fcaf8296853af8c40fb27202711a5e893f41879
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index dd2505f..702035c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit dd2505fed033cdd4c6a76fed951aeef35971079f
+Subproject commit 702035c04ad807206a1649edfb24b5cc9caac15d