Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Select the right Functest repos when master"
  - Select the right Functest repos when master

    Else OpenStack Rocky is verified by Queens upper-contraints.

    Change-Id: I5bfcb4895e64ab911c1131e8bfeb09eac2775754
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1552a76..a00d94e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1552a769f7f45213d8a926418b9830d8f15b2b03
+Subproject commit a00d94e18f211f7d90280961decd91cf1632c448