cros-camera-algo: add 'stop on' condition

Services should have a 'stop on' condition to avoid being reaped by
chromeos_shutdown and to make for a tidier teardown.

BUG=none
TEST=watch syslog from shutdown

Change-Id: I297c44c1c38309bbdf1e3239a9c2a1ac697e6d76
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1273905
Reviewed-by: Hung-yu Wu <hywu@chromium.org>
diff --git a/common/init/cros-camera-algo.conf b/common/init/cros-camera-algo.conf
index ce2ecc1..e0b9149 100644
--- a/common/init/cros-camera-algo.conf
+++ b/common/init/cros-camera-algo.conf
@@ -6,6 +6,7 @@
 author        "chromium-os-dev@chromium.org"
 
 start on started system-services
+stop on stopping system-services
 expect fork
 respawn
 respawn limit 10 5