Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 3cfccedf319071827990baae6156079974249afa
  - Merge "Exclude functest-tempest in master builds"
  - Exclude functest-tempest in master builds

    It's being removed and we do first merge that change to allow
    verifying the related patch in Functest [1]

    [1] https://gerrit.opnfv.org/gerrit/#/c/68167/

    Change-Id: I2c069c65c771ef076556c2758ae003dba03c2f28
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 49d6194..3cfcced 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 49d61940222066a3e8f5d1491fc611558bb2788e
+Subproject commit 3cfccedf319071827990baae6156079974249afa