Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 54a31ca08f87633080ebefaf43e8cfbf6bbca608
  - Temporarily remove cnf_testsuite from gates

    It allows verifying if cnf_testsuite is disruptive as it seems.

    Change-Id: I304f4ae360ba4d683659a38609e9e340938da699
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d5d800b..54a31ca 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d5d800b8c36137ccfe1ac1703c23c1f1039f72fb
+Subproject commit 54a31ca08f87633080ebefaf43e8cfbf6bbca608