Update git submodules

* Update docs/submodules/releng from branch 'master'
  to b1c8bef4f0814750bb6bf99feb7eb4571e3eaf03
  - Replace few false healthcheck by smoke

    It completes the previous change "Add latest tempest plugins integrated
    into Functest" [1].

    [1] https://gerrit.opnfv.org/gerrit/c/releng/+/68700

    Change-Id: If58d1d560e103b59ececb0f31ef47e052ca4105a
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index efa227e..b1c8bef 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit efa227e45ef2d4c4344ec0bf0449eefc1e9dcaeb
+Subproject commit b1c8bef4f0814750bb6bf99feb7eb4571e3eaf03