Update git submodules

* Update docs/submodules/releng from branch 'master'
  to d255c3cf1ce784d611a947063728a600f5f38154
  - Rename Functest CNTT testcases in RI

    Test DB and API don't support suites which raise side effects in Cachet
    if both IaaS verification and CNTT conformance are executed.

    Change-Id: I5c805c2d321d25343724da862fbf367d68ddecde
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4a54e1e..d255c3c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4a54e1e17c1c69e25b06f11ec9f6f84c186d6b98
+Subproject commit d255c3cf1ce784d611a947063728a600f5f38154