Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 20ec9ff5e9cf8fb9191561233f858a26f400d78f
  - Remove all tests from functest-smoke-cntt in CNTT gates

    They are still executed in the daily jobs but the purpose of this gate
    is to vote -1 if the test results decrease.

    Change-Id: I77c94905ffe7b121a0cec768e463db38f6062529
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0ab6eb0..20ec9ff 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0ab6eb0f08bda3008f70370058d45192687fe5ab
+Subproject commit 20ec9ff5e9cf8fb9191561233f858a26f400d78f