Update git submodules

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

    Change-Id: I6ba2666a0dbec23c7a854c030113b809bd9a328a
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4dbe661..d7ed457 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4dbe6616e33c7eb9208b4f15378e6d1cc1693e80
+Subproject commit d7ed45793e56243d63da12f184db96731d1d6a1c