Update git submodules

* Update docs/submodules/releng from branch 'master'
  - run anteater ci gate on lf-build2

    Change-Id: I21aca84c2ce5526f4a0942b21c50455c3d8aa4bd
    Signed-off-by: Aric Gardner <agardner@linuxfounation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2a39555..7228a57 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2a3955506b0ffea755f20a7b32080f51cc52ba83
+Subproject commit 7228a572ab291081b3fcc5115d06c6a6901b3fea