Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 83e216498dbeffc7777cdafff97da7302e38cfbe
  - Prepare Functest Leguer

    OpenStack Victoria is being released [1].

    [1] https://releases.openstack.org/victoria/index.html

    Change-Id: Id87d8bcf4e56c37eda00f84eb12d02d6f526f623
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4e4ed76..83e2164 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4e4ed760ca02f76f32f7a2dc648cc01dbcf58ec9
+Subproject commit 83e216498dbeffc7777cdafff97da7302e38cfbe