Update git submodules

* Update docs/submodules/releng from branch 'master'
  to fd4babf48686fd28e7d20698a8a5edeee75d6d2b
  - Doctor testing run parallel

    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>
    Change-Id: Ie59a3ba78ac499d413eb3f7c4b99cdbb1fdaba9f

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 14dd353..fd4babf 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 14dd353e905d596f44ddbb5bddfce82c2a955be1
+Subproject commit fd4babf48686fd28e7d20698a8a5edeee75d6d2b