Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 57b4073b66c71510ac32da878dcdcb318482b4b2
  - Exclude functest-features if kali

    Change-Id: I23fe4ba837ebdb48d4cb5eb260fa728f450387b6
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index dd3f53c..57b4073 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit dd3f53c5df1e2a48d5d9c273f209247d0409130f
+Subproject commit 57b4073b66c71510ac32da878dcdcb318482b4b2