Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "fuel: Add functest and yardstick as downstream jobs"
  - fuel: Add functest and yardstick as downstream jobs

    Change-Id: I90f42dc36ed0555788b517572088b5f09c1569fb
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 22867ff..a3fae75 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 22867ff612ce24a01d33f00145e6f47e0073a40e
+Subproject commit a3fae75c6dbd58ceb68fd774af703d766962c687