Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Remove noop for tag creation.

    This script is tested, and should now be allowed to create tags.

    Change-Id: Ia87341c9cb6397700442a11c38d502fed8dd4743
    Signed-off-by: Aric Gardner <agardner@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ec97db7..dc4b9d1 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ec97db7dfabb5f349ab5b2631f3e20ec4a016a69
+Subproject commit dc4b9d1ad316e9055ccb3767c4572ad22cbe43a5