Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 648a5877e31275759dbfebd7d62b2753314910de
  - Publish Functest Kali project jobs

    Change-Id: I881b78291049b94b53650adb19bf6174854952b6
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index f37066d..648a587 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit f37066dea9d82cd7875b8878e72e6348dcb18c21
+Subproject commit 648a5877e31275759dbfebd7d62b2753314910de