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

src/platform/dev/stateful_update

 #!/bin/sh
 
 # Copyright (c) 2010 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 scripts performs update of stateful partition directories useful for
 # dev_mode.
 
 # Die on error.
 set -e
 
 STATEFUL_DIR="/mnt/stateful_partition"
 STATEFUL_IMAGE="$STATEFUL_DIR/stateful.image"
 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"
 
 # Prepare directories for update.
 rm -rf "$STATEFUL_DIR/var_new" "$STATEFUL_DIR/dev_image_new"
 
 # Prepare and mount new stateful partition.
 rm -rf "$STATEFUL_MOUNT_POINT"
 mkdir -p "$STATEFUL_MOUNT_POINT"
 
 # Unzip mount and copy the relevant directories.
 # Get the update.
 eval "wget -O - \"$STATEFUL_UPDATE_URL\"" | gzip -d > $STATEFUL_IMAGE
 trap "rm -f \"$STATEFUL_IMAGE\"" EXIT
 mount -n -o loop "$STATEFUL_IMAGE" "$STATEFUL_MOUNT_POINT"
 if [ -d "$STATEFUL_MOUNT_POINT/var" ] && \
     [ -d "$STATEFUL_MOUNT_POINT/dev_image" ] ; then
   cp -rf "$STATEFUL_MOUNT_POINT/var" "$STATEFUL_DIR/var_new"
   cp -rf "$STATEFUL_MOUNT_POINT/dev_image" "$STATEFUL_DIR/dev_image_new"
   touch "$STATEFUL_DIR/.update_available"
 else
   echo "No update available"
 fi
 
 umount -n -d "$STATEFUL_MOUNT_POINT"
 
 rm -f "$STATEFUL_IMAGE"
 
-trap - EXIT
+trap - EXIT