Add sanity test for /etc/lsb-release file in CrOS images

scripts/image_signing/ensure_sane_lsb-release.config

Index: scripts/image_signing/ensure_sane_lsb-release.config
diff --git a/scripts/image_signing/ensure_sane_lsb-release.config b/scripts/image_signing/ensure_sane_lsb-release.config
new file mode 100644
index 0000000000000000000000000000000000000000..0efa6913a01b6d0d9888a208f615eef2525fea58
--- /dev/null
+++ b/scripts/image_signing/ensure_sane_lsb-release.config
@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+expected_auserver="https://tools.google.com/service/update2"
+expected_release_name="Chrome OS"
+
+expected_boards=(
+    x86-agz
+    x86-mario
+)
+expected_release_tracks=(
+    beta-channel
+    dev-channel
+)
+
+expected_appid_x86_agz="{23F5C60F-7655-4BF4-90FB-BFDE16408308}"
+expected_appid_x86_mario="{87efface-864d-49a5-9bb3-4b050a7c227a}"