Enable fast build by default in build_image and mod_image_for_test.sh.

mod_image_for_test.sh

 #!/bin/bash
 
 # Copyright (c) 2009 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.
 
 # Script to modify a keyfob-based chromeos system image for testability.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
@@ skipping 14 matching lines @@
     "Modify the image for factory install shim"
 DEFINE_string image "" "Location of the rootfs raw image file" i
 DEFINE_boolean installmask $FLAGS_TRUE \
     "Use INSTALL_MASK to shrink the resulting image." m
 DEFINE_integer jobs -1 \
     "How many packages to build in parallel at maximum." j
 DEFINE_string qualdb "" "Location of qualified component file" d
 DEFINE_boolean yes $FLAGS_FALSE "Answer yes to all prompts" y
 DEFINE_string build_root "/build" \
     "The root location for board sysroots."
-DEFINE_boolean fast ${FLAGS_FALSE} "Call many emerges in parallel"
+DEFINE_boolean fast ${DEFAULT_FAST} "Call many emerges in parallel"
 
 
 # Parse command line
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
 EMERGE_CMD="emerge"
 EMERGE_BOARD_CMD="emerge-${FLAGS_board}"
 if [ "${FLAGS_fast}" -eq "${FLAGS_TRUE}" ]; then
   echo "Using alternate emerge"
@@ skipping 179 matching lines @@
   bash
   popd
 fi
 
 cleanup
 
 print_time_elapsed
 
 trap - EXIT