init: Add a factory-wipe upstart config file to test image

The factory-wipe service starts factory wiping by invoking the script:
/usr/local/factory/bin/wipe_in_tmpfs

BUG=chromium:427793
CQ-DEPEND=CL:240671
TEST=Manual test on Paine
     1. Install factory bundle on Paine
     2. Prepare a tmpfs under /usr/local/factory/sh/wipe_tmpfs
     3. start factory-wipe

Reviewed-on: https://chromium-review.googlesource.com/242789
Commit-Ready: Shun-Hsing Ou <shunhsingou@chromium.org>
Commit-Ready: Bowgo Tsai <bowgotsai@chromium.org>
Tested-by: Shun-Hsing Ou <shunhsingou@chromium.org>
Tested-by: Bowgo Tsai <bowgotsai@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
(cherry picked from commit 843750bc429f4a42d104dd034ab00f203fc5c8d3)
Change-Id: Ib8c4cdaddb4dcb18475ac8704aecc0f8d885ae9a
Reviewed-on: https://chromium-review.googlesource.com/306835
Reviewed-by: Shun-Hsing Ou <shunhsingou@chromium.org>
diff --git a/init/test-init/factory-wipe.conf b/init/test-init/factory-wipe.conf
new file mode 100644
index 0000000..f55317f
--- /dev/null
+++ b/init/test-init/factory-wipe.conf
@@ -0,0 +1,11 @@
+# Copyright 2015 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.
+
+# This service is not automatically started but should be triggered by
+# explicit call.
+
+description    "Start factory wiping"
+author         "chromium-os-dev@chromium.org"
+
+exec /usr/local/factory/bin/wipe_in_tmpfs