Make stateful_update use ping_omaha's flags. small devserver clenaups.

src/platform/dev/stateful_update

Index: src/platform/dev/stateful_update
diff --git a/src/platform/dev/stateful_update b/src/platform/dev/stateful_update
index 9274618abf112537904cc8237e58675d0f4cb099..5ed234582bcf68d4069eefe4d92da9b132bf603f 100755
--- a/src/platform/dev/stateful_update
+++ b/src/platform/dev/stateful_update
@@ -16,8 +16,13 @@ STATEFUL_MOUNT_POINT="/tmp/s"
 
 PING_OMAHA=/opt/google/memento_updater/ping_omaha.sh
 
+if [ -n "$1" ] ; then
+  OMAHA_ARG="--omaha_url=$1"
+fi
+
 # Get image url for stateful image
-OMAHA_CHECK_OUTPUT=$($PING_OMAHA --app_version ForcedUpdate 2> /dev/null)
+OMAHA_CHECK_OUTPUT=$($PING_OMAHA --app_version ForcedUpdate \
+   "$OMAHA_ARG" 2> /dev/null)
 ROOT_UPDATE_URL=$(echo "$OMAHA_CHECK_OUTPUT" | grep '^URL=' | cut -d = -f 2-)
 STATEFUL_UPDATE_URL="$(dirname "$ROOT_UPDATE_URL")/stateful.image.gz"
 
@@ -46,4 +51,4 @@ umount -n -d "$STATEFUL_MOUNT_POINT"
 
 rm -f "$STATEFUL_IMAGE"
 
-trap - EXIT
+trap - EXIT