Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Create Stable Branch Jobs for auto"
  - Create Stable Branch Jobs for auto

    Change-Id: I1541a0e277891b526a671953bf33daab842b524e
    Signed-off-by: jenkins-ci <jenkins-opnfv-ci@opnfv.org>
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 48ff610..74193ca 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 48ff610b876ebbc6c011251bfd363e389b350b80
+Subproject commit 74193ca1f6632daeb095ec32e2b146dc73bfc1f8