Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Add exit status, remove awk warning

    Change-Id: I090e601b45b58fae4235867536553570f2674f9a
    Signed-off-by: Aric Gardner <agardner@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 69591a5..e4e6211 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 69591a53f460f0a174b274f643a44f9102d2d78a
+Subproject commit e4e6211295ae7d1d18b481731fca188a1d1fd2af