Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Revert "functest-docker: Build all images on same host"

    This reverts commit d7ed45793e56243d63da12f184db96731d1d6a1c.

    Change-Id: Ie7cc94419969e5c95abd227ff0f159f0683c4386

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d7ed457..c8063f1 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d7ed45793e56243d63da12f184db96731d1d6a1c
+Subproject commit c8063f1a9ed95e184fe93fdd61b0b537d83e7fce